Automatic merge from submit-queue (batch tested with PRs 55873, 56156). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

kubectl: Add Terminating state to PVCs

kubectl should show something when a PVC has a deletion timestamp and is waiting for deletion. This patch follows Pod - it adds Terminating state.

For easier discovery of errors, finalizers are printed in `kubectl describe pvc`.

This is part of [PVC finalizer feature for 1.9](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/storage/postpone-pvc-deletion-if-used-in-a-pod.md) where we will keep PVC waiting for deletion for a longer time than before so users should know what is going on.

/sig cli

**Release note**:
```release-note
NONE
```