Automatic merge from submit-queue (batch tested with PRs 49855, 49915)

Let controllers ignore initialization timeout when creating pods

Partially address https://github.com/kubernetes/kubernetes/issues/48893#issuecomment-318540129.

This only updates the controllers that create pods with `GenerateName`.

The controllers ignore the timeout error when creating the pods, depending on how the initialization progress:
* If the initialization is successful in less than 5 mins, the controller will observe the creation via the informer. All is good.
* If the initialization fails, server will delete the pod, but the controller won't receive any event. The controller will not create new pod until the Creation expectation expires in 5 min.
* If the initialization takes too long (> 5 mins), the Creation expectation expires and the controller will create extra pods.

I'll send follow-up PRs to fix the latter two cases, e.g., by refactoring the sharedInformer.