tighten and simplify owners in some staging repos
tighten and simplify owners in some staging repos

Kubernetes-commit: e7871dbab26459163fd916b83563c4815c7ca43c

caesarxuchao/kube-aggregator,caesarxuchao/kube-aggregator,kubernetes/kube-aggregator,caesarxuchao/kube-aggregator,kubernetes/kube-aggregator