Add an HA test case

[roycaihw]

This PR builds on top of #82.

It adds an HA test case to make sure: if one API server's StorageVersion record got corrupted (e.g. performed by a cluster admin by accident), the API server's periodic self-correction will restore the common encoding version, and trigger a migration.

/assign @roycaihw

TODO:

• add a MULTIZONE prow job

[k8s-ci-robot]

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[k8s-ci-robot]

@roycaihw: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kube-storage-version-migrator-fully-automated-e2e	c3e0972	link	/test pull-kube-storage-version-migrator-fully-automated-e2e
pull-kube-storage-version-migrator-disruptive	c3e0972	link	/test pull-kube-storage-version-migrator-disruptive
pull-kube-storage-version-migrator-ha-master	c3e0972	link	/test pull-kube-storage-version-migrator-ha-master

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[roycaihw]

/close

in favor of #85

[k8s-ci-robot]

@roycaihw: Closed this PR.

In response to this:

/close

in favor of #85

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