Automatic merge from submit-queue (batch tested with PRs 51929, 52015, 51906, 52069, 51542). 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>..
validate federation cluster spec CIDR
**What this PR does / why we need it**:
Add extra validation for cluster CIDR.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
fix https://github.com/kubernetes/kubernetes/issues/29911
**Special notes for your reviewer**:
none
**Release note**:
none
1c79884fbe