Automatic merge from submit-queue (batch tested with PRs 49533, 49264)
rename stop.go to delete.go to avoid confusion
**What this PR does / why we need it**:
Refer to [comments](https://github.com/kubernetes/kubernetes/pull/46784#issuecomment-317582927) from @foxish and @janetkuo
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
xref #46784
**Special notes for your reviewer**:
/cc @janetkuo @foxish
**Release note**:
```release-note
rename stop.go file to delete.go to avoid confusion
```
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