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PSP plugin: allow authorizing via "use" verb in policy API group
**What this PR does / why we need it**:
In order to determine whether a service account/user has access to PSP, PodSecurityPolicy admission plugin tests whether a service account/user is authorized for "use" verb in `extensions` API group. As PSP is being migrated to `policy` API group, we need to support its new location. This PR adds such a support by checking in both API groups.
**Which issue(s) this PR fixes**:
Addressed to: https://github.com/kubernetes/features/issues/5
Follow-up to: https://github.com/kubernetes/kubernetes/pull/54933
Automatic merge from submit-queue
Correct the comment in PSP examples.
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
none
```
Kubernetes Submit Queue