Integration test should not directly update the pods in the datastore

[liu-cong]

What would you like to be added: For the sake of simplicity, our integration tests injects fake pods into the datastore. This essentially bypasses the pod reconciler.

Why is this needed: This gives us coverage on the pod reconciler, and make the code cleaner.

[ahg-g]

Addressed in #431

[ahg-g]

There are still a number of followups mentioned there.