[v1alpha2] E2E test for replica restart policy

[jlewi]

We'd like to have E2E tests for the pod restart policy.

The restart policy controls whether pods get restarted based on the exit code.

A simple E2E test would just be a simple script that exits with the desired code. We could then verify that the pod is restarted or not.

Verification might be a little tricky.

A simple way to do this would be:

1. The script can store state in shared storage

   • We can use this to restart a fixed number of times

2. The test harness can verify that the correct state exists.

Some storage options

• NFS
• GCS
• PV
• Cloud Logging

Adding this to the 0.2.0 release but it likely will be pushed to 0.3.

[gaocegege]

https://github.com/gaocegege/k8s/tree/termination-example/examples/v1alpha2/restartpolicy

I used code here to test the PR #638