Automatic merge from submit-queue (batch tested with PRs 56337, 56546, 56550, 56633, 56635). 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 redundant code in container manager.
- Reuse stub implementations from unsupported implementations.
- Delete test file that didn't contain any tests.
**Release note**:
```release-note
NONE
```
/kind cleanup
/sig node
fa0a1a3d7a