Automatic merge from submit-queue. 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>.
support imagePullSecrets and imagePullPolicy in kubefed init
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#50718
**Special notes for your reviewer**:
/assign @gyliu513
**Release note**:
```release-note
support imagePullSecrets and imagePullPolicy in kubefed init
```
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