Automatic merge from submit-queue. 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>.

Cleanup & fix PodSecurityPolicy field path usage

I noticed the field paths were incorrect for a bunch of PodSecurityPolicy validation errors. This PR fixes the errors, and makes it more explicit what the paths are pointing to in some cases.

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

/kind cleanup
/sig auth