vm/isolated: add initial support for fuzzing chromebooks

(WIP PR)

Add support for StartupScript.
* Modify Config{} to contain PostRepairScript.
* Allow repair() to execute a startup_script after reboot. The contents
of this script execute on the DUT.

Add pstore support:
* Modify Config{} to contain Pstore.
* Modify Diagnose() to reboot the DUT and fetch pstore logs,
conditional on inst.cfg.Pstore.
* Add readPstoreContents().
* Allow clearing previous pstore logs upon Create() and after use inside
readPstoreContents().
* Fetching pstore crashlogs relies on reliably getting lost connection
on DUT reboot. Use "ServerAliveInterval=6 ServerAliveCountMax=5" ssh
options when running syz-fuzzer with Pstore support enabled.

Allow parsing pstore contents:
* Diagnose() now returns pstore contents.

Refactoring:
* Move out some reusable parts of repair() to waitRebootAndSSH().
* Have an early return inside repair() if inst.waitForSSH() fails.

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