vm/cuttlefish, vm/gce: add custom commands for reading console

For Cuttlefish we want to read the console from the emulated device
instead of the "host" GCE instance. This allows us to pass a custom
command through to gce.Pool (and then to gce.instance) which is used
instead.

We also need to update runOnHost() to use osutil directly instead of
delegating to gceInst.Run(), since it's called during VM creation. When
setting up the VM the kernel logs don't exist yet.

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