E2E test to validate pod names

[jlewi]

We had some regressions with v1alpha2 with pod names:

See #644 & #633 we should consider adding an E2E test to prevent regressions.

[lluunn]

I will try this one

[jlewi]

We've added a bunch of E2E tests to TFJob operator; its possible we now have test coverage for this; we should check.

[jlewi]

I don't think anyone is working on this; should we punt to 0.5?

/cc @richardsliu

[richardsliu]

This is somewhat covered by recent e2e tests. For example the runconfig e2e tests will send request specifically to service endpoints with the assumption that the pod names are formatted as "[job-name]-[replica-type]-[index]". But it may be good to explicitly validate the names.