[test] copy labels and anotations to pod from tfjob

[gaocegege]

• Implement it in v1alpha2
• Add test for v1alpha1

[jlewi]

Are you suggesting that annotations in the TFJob metadata be copied to the pod metadata? Or are you suggesting that metadata inside the TFJob PodTemplateSpec's be copied to the actual pods created.

If the latter then I agree with you. This is necessary to support various extensions/features that rely on annotations (e.g. admission controllers, TPUs).

Bumping to P1 because I'd like this to be fixed in our 0.2 release so that TPUs are well supported.

[gaocegege]

Ref #542

The latter, I think.

[gaocegege]

We already implemented it in v1alpha2, my mistake.

[gaocegege]

I set the priority to p2 sine we implemented it and the last work is to add test cases.

[gaocegege]

Close by #658