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add unit test for ValidateStatefulSet
Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>
**What this PR does / why we need it**:
add unit test for ValidateStatefulSetSpec
**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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