Automatic merge from submit-queue (batch tested with PRs 52485, 52443, 52597, 52450, 51971). 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>..

Some kubelet flags do not accept their default values

Correct the flags and add a round trip test that ensure these do not
break again in the future.

@deads2k as observed when we tried to turn flags into args.