Automatic merge from submit-queue (batch tested with PRs 61453, 61393, 61379, 61373, 61494). 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>.
remove kube-apiserver `--storage-version` flag
#`--storage-version` has been deprecated more than a year ago, should remove it.
**Release note**:
```release-note
Remove kube-apiserver `--storage-version` flag, use `--storage-versions` instead.
```