Automatic merge from submit-queue (batch tested with PRs 51031, 51705, 51888, 51727, 51684). 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>..

Avoid hard-coding location for auto-generated cert files

**What this PR does / why we need it**:
This fixes the confusing/incorrect help message for "--tls-cert-file" in apiserver package.

**Which issue this PR fixes**:  fixes #51887 

**Special notes for your reviewer**:
Please advise if a release note is needed.

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