go.mod: switch to modules for dependency management

Godep is long deprecated and modules is the future.
Updating dependencies with godep is painful and non-transparent.
This will hopefully help to create custom golangci-lint linters.
The change was created with:

go mod init
rm -rf vendor
go mod vendor

Fixes #1247

17 files changed, 11 insertions, 432 deletions

diff --git a/vendor/github.com/googleapis/gax-go/.gitignore b/vendor/github.com/googleapis/gax-go/.gitignore
deleted file mode 100644
index 289bf1eb7..000000000
--- a/vendor/github.com/googleapis/gax-go/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.cover
diff --git a/vendor/github.com/googleapis/gax-go/CODE_OF_CONDUCT.md b/vendor/github.com/googleapis/gax-go/CODE_OF_CONDUCT.md
deleted file mode 100644
index 46b2a08ea..000000000
--- a/vendor/github.com/googleapis/gax-go/CODE_OF_CONDUCT.md
+++ /dev/null
@@ -1,43 +0,0 @@
-# Contributor Code of Conduct
-
-As contributors and maintainers of this project,
-and in the interest of fostering an open and welcoming community,
-we pledge to respect all people who contribute through reporting issues,
-posting feature requests, updating documentation,
-submitting pull requests or patches, and other activities.
-
-We are committed to making participation in this project
-a harassment-free experience for everyone,
-regardless of level of experience, gender, gender identity and expression,
-sexual orientation, disability, personal appearance,
-body size, race, ethnicity, age, religion, or nationality.
-
-Examples of unacceptable behavior by participants include:
-
-* The use of sexualized language or imagery
-* Personal attacks
-* Trolling or insulting/derogatory comments
-* Public or private harassment
-* Publishing other's private information,
-such as physical or electronic
-addresses, without explicit permission
-* Other unethical or unprofessional conduct.
-
-Project maintainers have the right and responsibility to remove, edit, or reject
-comments, commits, code, wiki edits, issues, and other contributions
-that are not aligned to this Code of Conduct.
-By adopting this Code of Conduct,
-project maintainers commit themselves to fairly and consistently
-applying these principles to every aspect of managing this project.
-Project maintainers who do not follow or enforce the Code of Conduct
-may be permanently removed from the project team.
-
-This code of conduct applies both within project spaces and in public spaces
-when an individual is representing the project or its community.
-
-Instances of abusive, harassing, or otherwise unacceptable behavior
-may be reported by opening an issue
-or contacting one or more of the project maintainers.
-
-This Code of Conduct is adapted from the [Contributor Covenant](http://contributor-covenant.org), version 1.2.0,
-available at [http://contributor-covenant.org/version/1/2/0/](http://contributor-covenant.org/version/1/2/0/)
diff --git a/vendor/github.com/googleapis/gax-go/CONTRIBUTING.md b/vendor/github.com/googleapis/gax-go/CONTRIBUTING.md
deleted file mode 100644
index b0404fb64..000000000
--- a/vendor/github.com/googleapis/gax-go/CONTRIBUTING.md
+++ /dev/null
@@ -1,32 +0,0 @@
-Want to contribute? Great! First, read this page (including the small print at the end).
-
-### Before you contribute
-Before we can use your code, you must sign the
-[Google Individual Contributor License Agreement]
-(https://cla.developers.google.com/about/google-individual)
-(CLA), which you can do online. The CLA is necessary mainly because you own the
-copyright to your changes, even after your contribution becomes part of our
-codebase, so we need your permission to use and distribute your code. We also
-need to be sure of various other things—for instance that you'll tell us if you
-know that your code infringes on other people's patents. You don't have to sign
-the CLA until after you've submitted your code for review and a member has
-approved it, but you must do it before we can put your code into our codebase.
-Before you start working on a larger contribution, you should get in touch with
-us first through the issue tracker with your idea so that we can help out and
-possibly guide you. Coordinating up front makes it much easier to avoid
-frustration later on.
-
-### Code reviews
-All submissions, including submissions by project members, require review. We
-use Github pull requests for this purpose.
-
-### Breaking code changes
-When a breaking change is added, CI/CD will fail. If the change is expected,
-add a BREAKING_CHANGE_ACCEPTABLE=<reason> line to the CL description. This will
-cause CI/CD to skip checking breaking changes.
-
-### The small print
-Contributions made by corporations are covered by a different agreement than
-the one above, the
-[Software Grant and Corporate Contributor License Agreement]
-(https://cla.developers.google.com/about/google-corporate).
diff --git a/vendor/github.com/googleapis/gax-go/README.md b/vendor/github.com/googleapis/gax-go/README.md
deleted file mode 100644
index aae170fb6..000000000
--- a/vendor/github.com/googleapis/gax-go/README.md
+++ /dev/null
@@ -1,27 +0,0 @@
-Google API Extensions for Go
-============================
-
-[![GoDoc](https://godoc.org/github.com/googleapis/gax-go?status.svg)](https://godoc.org/github.com/googleapis/gax-go)
-
-Google API Extensions for Go (gax-go) is a set of modules which aids the
-development of APIs for clients and servers based on `gRPC` and Google API
-conventions.
-
-To install the API extensions, use:
-
-```
-go get -u github.com/googleapis/gax-go/v2
-```
-
-**Note:** Application code will rarely need to use this library directly,
-but the code generated automatically from API definition files can use it
-to simplify code generation and to provide more convenient and idiomatic API surface.
-
-Go Versions
-===========
-This library requires Go 1.6 or above.
-
-License
-=======
-BSD - please see [LICENSE](https://github.com/googleapis/gax-go/blob/master/LICENSE)
-for more information.
diff --git a/vendor/github.com/googleapis/gax-go/RELEASING.md b/vendor/github.com/googleapis/gax-go/RELEASING.md
deleted file mode 100644
index 0557654b2..000000000
--- a/vendor/github.com/googleapis/gax-go/RELEASING.md
+++ /dev/null
@@ -1,30 +0,0 @@
-# How to release v1
-
-1. Determine the current release version with `git tag -l`. It should look
-   something like `vX.Y.Z`. We'll call the current version `$CV` and the new
-   version `$NV`.
-1. On master, run `git log $CV..` to list all the changes since the last
-   release.
-   a. NOTE: Some commits may pertain to only v1 or v2. Manually introspect
-   each commit to figure which occurred in v1.
-1. Edit `CHANGES.md` to include a summary of the changes.
-1. Mail the CL containing the `CHANGES.md` changes. When the CL is approved,
-   submit it.
-1. Without submitting any other CLs:
-   a. Switch to master.
-   b. `git pull`
-   c. Tag the repo with the next version: `git tag $NV`. It should be of the
-   form `v1.Y.Z`.
-   d. Push the tag: `git push origin $NV`.
-1. Update [the releases page](https://github.com/googleapis/google-cloud-go/releases)
-   with the new release, copying the contents of the CHANGES.md.
-
-# How to release v2
-
-Same process as v1, once again noting that the commit list may include v1
-commits (which should be pruned out). Note also whilst v1 tags are `v1.Y.Z`, v2
-tags are `v2.Y.Z`.
-
-# On releasing multiple major versions
-
-Please see https://github.com/golang/go/wiki/Modules#releasing-modules-v2-or-higher.
diff --git a/vendor/github.com/googleapis/gax-go/call_option.go b/vendor/github.com/googleapis/gax-go/call_option.go
deleted file mode 100644
index 5bd48972b..000000000
--- a/vendor/github.com/googleapis/gax-go/call_option.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2016, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package gax
-
-import (
-	v2 "github.com/googleapis/gax-go/v2"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
-)
-
-// CallOption is an option used by Invoke to control behaviors of RPC calls.
-// CallOption works by modifying relevant fields of CallSettings.
-type CallOption = v2.CallOption
-
-// Retryer is used by Invoke to determine retry behavior.
-type Retryer = v2.Retryer
-
-// WithRetry sets CallSettings.Retry to fn.
-func WithRetry(fn func() Retryer) CallOption {
-	return v2.WithRetry(fn)
-}
-
-// OnCodes returns a Retryer that retries if and only if
-// the previous attempt returns a GRPC error whose error code is stored in cc.
-// Pause times between retries are specified by bo.
-//
-// bo is only used for its parameters; each Retryer has its own copy.
-func OnCodes(cc []codes.Code, bo Backoff) Retryer {
-	return v2.OnCodes(cc, bo)
-}
-
-// Backoff implements exponential backoff.
-// The wait time between retries is a random value between 0 and the "retry envelope".
-// The envelope starts at Initial and increases by the factor of Multiplier every retry,
-// but is capped at Max.
-type Backoff = v2.Backoff
-
-// WithGRPCOptions allows passing gRPC call options during client creation.
-func WithGRPCOptions(opt ...grpc.CallOption) CallOption {
-	return v2.WithGRPCOptions(opt...)
-}
-
-// CallSettings allow fine-grained control over how calls are made.
-type CallSettings = v2.CallSettings
diff --git a/vendor/github.com/googleapis/gax-go/gax.go b/vendor/github.com/googleapis/gax-go/gax.go
deleted file mode 100644
index 006739804..000000000
--- a/vendor/github.com/googleapis/gax-go/gax.go
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2016, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Package gax contains a set of modules which aid the development of APIs
-// for clients and servers based on gRPC and Google API conventions.
-//
-// Application code will rarely need to use this library directly.
-// However, code generated automatically from API definition files can use it
-// to simplify code generation and to provide more convenient and idiomatic API surfaces.
-package gax
-
-// Version specifies the gax version.
-const Version = "1.0.1"
diff --git a/vendor/github.com/googleapis/gax-go/go.mod b/vendor/github.com/googleapis/gax-go/go.mod
deleted file mode 100644
index 8b088e52b..000000000
--- a/vendor/github.com/googleapis/gax-go/go.mod
+++ /dev/null
@@ -1,13 +0,0 @@
-module github.com/googleapis/gax-go
-
-go 1.11
-
-require (
-	github.com/golang/protobuf v1.3.1
-	github.com/googleapis/gax-go/v2 v2.0.5
-	golang.org/x/exp v0.0.0-20190221220918-438050ddec5e
-	golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3
-	golang.org/x/tools v0.0.0-20190114222345-bf090417da8b
-	google.golang.org/grpc v1.19.0
-	honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099
-)
diff --git a/vendor/github.com/googleapis/gax-go/go.sum b/vendor/github.com/googleapis/gax-go/go.sum
deleted file mode 100644
index 8fd8a46c1..000000000
--- a/vendor/github.com/googleapis/gax-go/go.sum
+++ /dev/null
@@ -1,35 +0,0 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
-github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/googleapis/gax-go/v2 v2.0.5 h1:sjZBwGj9Jlw33ImPtvFviGYvseOtDM7hkSKB7+Tv3SM=
-github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
-golang.org/x/exp v0.0.0-20190221220918-438050ddec5e h1:dVreTP5bOOWt5GFwwvgTE2iU0TkIqi2x3r0b8qGlp6k=
-golang.org/x/exp v0.0.0-20190221220918-438050ddec5e/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
-golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3 h1:x/bBzNauLQAlE3fLku/xy92Y8QwKX5HZymrMz2IiKFc=
-golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
-golang.org/x/net v0.0.0-20180826012351-8a410e7b638d h1:g9qWBGx4puODJTMVyoPrpoxPFgVGd+z1DZwjfRu4d0I=
-golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180830151530-49385e6e1522 h1:Ve1ORMCxvRmSXBwJK+t3Oy+V2vRW2OetUQBq4rJIkZE=
-golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b h1:qMK98NmNCRVDIYFycQ5yVRkvgDUFfdP8Ip4KqmDEB7g=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099 h1:XJP7lxbSxWLOMNdBE4B/STaqVy6L73o0knwj2vIlxnw=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/vendor/github.com/googleapis/gax-go/header.go b/vendor/github.com/googleapis/gax-go/header.go
deleted file mode 100644
index e1a0af1ba..000000000
--- a/vendor/github.com/googleapis/gax-go/header.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2018, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package gax
-
-import v2 "github.com/googleapis/gax-go/v2"
-
-// XGoogHeader is for use by the Google Cloud Libraries only.
-//
-// XGoogHeader formats key-value pairs.
-// The resulting string is suitable for x-goog-api-client header.
-func XGoogHeader(keyval ...string) string {
-	return v2.XGoogHeader(keyval...)
-}
diff --git a/vendor/github.com/googleapis/gax-go/invoke.go b/vendor/github.com/googleapis/gax-go/invoke.go
deleted file mode 100644
index 6422d3f73..000000000
--- a/vendor/github.com/googleapis/gax-go/invoke.go
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright 2016, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package gax
-
-import (
-	"context"
-	"time"
-
-	v2 "github.com/googleapis/gax-go/v2"
-)
-
-// APICall is a user defined call stub.
-type APICall = v2.APICall
-
-// Invoke calls the given APICall,
-// performing retries as specified by opts, if any.
-func Invoke(ctx context.Context, call APICall, opts ...CallOption) error {
-	return v2.Invoke(ctx, call, opts...)
-}
-
-// Sleep is similar to time.Sleep, but it can be interrupted by ctx.Done() closing.
-// If interrupted, Sleep returns ctx.Err().
-func Sleep(ctx context.Context, d time.Duration) error {
-	return v2.Sleep(ctx, d)
-}
diff --git a/vendor/github.com/googleapis/gax-go/tools.go b/vendor/github.com/googleapis/gax-go/tools.go
deleted file mode 100644
index ffb3ad482..000000000
--- a/vendor/github.com/googleapis/gax-go/tools.go
+++ /dev/null
@@ -1,33 +0,0 @@
-// +build tools
-
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// This package exists to cause `go mod` and `go get` to believe these tools
-// are dependencies, even though they are not runtime dependencies of any
-// package (these are tools used by our CI builds). This means they will appear
-// in our `go.mod` file, but will not be a part of the build. Also, since the
-// build target is something non-existent, these should not be included in any
-// binaries.
-
-package gax
-
-import (
-	_ "github.com/golang/protobuf/proto"
-	_ "github.com/golang/protobuf/protoc-gen-go"
-	_ "golang.org/x/exp/cmd/apidiff"
-	_ "golang.org/x/lint/golint"
-	_ "golang.org/x/tools/cmd/goimports"
-	_ "honnef.co/go/tools/cmd/staticcheck"
-)
diff --git a/vendor/github.com/googleapis/gax-go/LICENSE b/vendor/github.com/googleapis/gax-go/v2/LICENSE
index 6d16b6578..6d16b6578 100644
--- a/vendor/github.com/googleapis/gax-go/LICENSE
+++ b/vendor/github.com/googleapis/gax-go/v2/LICENSE
diff --git a/vendor/github.com/googleapis/gax-go/v2/call_option.go b/vendor/github.com/googleapis/gax-go/v2/call_option.go
index 8b7753969..b1d53dd19 100644
--- a/vendor/github.com/googleapis/gax-go/v2/call_option.go
+++ b/vendor/github.com/googleapis/gax-go/v2/call_option.go
@@ -94,25 +94,22 @@ func (r *boRetryer) Retry(err error) (time.Duration, bool) {
 	return 0, false
 }
 
-// Backoff implements exponential backoff. The wait time between retries is a
-// random value between 0 and the "retry period" - the time between retries. The
-// retry period starts at Initial and increases by the factor of Multiplier
-// every retry, but is capped at Max.
-//
-// Note: MaxNumRetries / RPCDeadline is specifically not provided. These should
-// be built on top of Backoff.
+// Backoff implements exponential backoff.
+// The wait time between retries is a random value between 0 and the "retry envelope".
+// The envelope starts at Initial and increases by the factor of Multiplier every retry,
+// but is capped at Max.
 type Backoff struct {
-	// Initial is the initial value of the retry period, defaults to 1 second.
+	// Initial is the initial value of the retry envelope, defaults to 1 second.
 	Initial time.Duration
 
-	// Max is the maximum value of the retry period, defaults to 30 seconds.
+	// Max is the maximum value of the retry envelope, defaults to 30 seconds.
 	Max time.Duration
 
-	// Multiplier is the factor by which the retry period increases.
+	// Multiplier is the factor by which the retry envelope increases.
 	// It should be greater than 1 and defaults to 2.
 	Multiplier float64
 
-	// cur is the current retry period.
+	// cur is the current retry envelope
 	cur time.Duration
 }
 
diff --git a/vendor/github.com/googleapis/gax-go/v2/gax.go b/vendor/github.com/googleapis/gax-go/v2/gax.go
index dfc4beb28..3fd1b0b84 100644
--- a/vendor/github.com/googleapis/gax-go/v2/gax.go
+++ b/vendor/github.com/googleapis/gax-go/v2/gax.go
@@ -36,4 +36,4 @@
 package gax
 
 // Version specifies the gax-go version being used.
-const Version = "2.0.5"
+const Version = "2.0.4"
diff --git a/vendor/github.com/googleapis/gax-go/v2/go.mod b/vendor/github.com/googleapis/gax-go/v2/go.mod
index e83e87b8b..9cdfaf447 100644
--- a/vendor/github.com/googleapis/gax-go/v2/go.mod
+++ b/vendor/github.com/googleapis/gax-go/v2/go.mod
@@ -1,5 +1,3 @@
 module github.com/googleapis/gax-go/v2
 
-go 1.11
-
 require google.golang.org/grpc v1.19.0
diff --git a/vendor/github.com/googleapis/gax-go/v2/invoke.go b/vendor/github.com/googleapis/gax-go/v2/invoke.go
index 749b9d234..fe31dd004 100644
--- a/vendor/github.com/googleapis/gax-go/v2/invoke.go
+++ b/vendor/github.com/googleapis/gax-go/v2/invoke.go
@@ -38,8 +38,8 @@ import (
 // APICall is a user defined call stub.
 type APICall func(context.Context, CallSettings) error
 
-// Invoke calls the given APICall, performing retries as specified by opts, if
-// any.
+// Invoke calls the given APICall,
+// performing retries as specified by opts, if any.
 func Invoke(ctx context.Context, call APICall, opts ...CallOption) error {
 	var settings CallSettings
 	for _, opt := range opts {