The usecase of this change:
When a super user grant some RBAC permissions to a group, he can use
--as-group to test whether the group get the permissions.
Note that now we support as-groups, as-user-extra in kubeconfig file
after this change.
Automatic merge from submit-queue
[Federation] Fix Running service controller in federation kubectl tests
Fixes: #42607
cc @nikhiljindal @kubernetes/sig-federation-bugs