kubernetes: Updating kube-proxy configmap doesn't reload/restart kube-proxy

/kind bug

What happened: I’ve updated the kube-proxy configmap after the master IPs changed but had to delete kube-proxy pods manually for the changes to take effect.

What you expected to happen: That kube-proxy reloads or get restarted on configmap changes.

How to reproduce it (as minimally and precisely as possible):

• Create cluster with kube-proxy and kube-proxy configmap pointing to the apiserver
• Change the kube-proxy config map, pointing to a new apiserver
• Deleted the old apiserver

After that, the cluster should become unresponsive due to kube-proxy still talking to the old apiservers.

Environment:

• Kubernetes version (use kubectl version): 1.8.4