Automatic merge from submit-queue (batch tested with PRs 54906, 54120, 54934, 54915, 54848). 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>.
Improve unit test coverage for network policy validation.
**What this PR does / why we need it**:
`ok k8s.io/kubernetes/pkg/apis/networking/validation 0.074s coverage: 87.8% of statements`
to
`ok k8s.io/kubernetes/pkg/apis/networking/validation 0.082s coverage: 100.0% of statements`
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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