Automatic merge from submit-queue (batch tested with PRs 67160, 67090, 67159, 66866, 62111). 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>.
Refactor checkRequest to allow it to be called from outside
**What this PR does / why we need it**:
Refactor checkRequest method to allow it to be called from outside of admission controller (most of its body does not depend on any quotaEvaluator properties).
```release-note
NONE
```
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