Automatic merge from submit-queue (batch tested with PRs 57746, 57621, 56839, 57464). 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>.
Fix PodCIDR flag: defaults come from the object, not as literal args to the flag function
The defaulter runs on the object before adding flags. Flags should be registered with defaults sourced from this object, so that the defaulter, not the flag var function, determines the canonical default value.
```release-note
NONE
```
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