text: Title: It's impossible to restart master in private clusters created via kube-up (provider GCE)
  Body: If you create a private cluster via kube-up using provider GCE, you won't be able to restart your master nodes.
  If you restart you master, the nodes won't be able to connect to your master.
  
  This is due to this line - https://github.com/kubernetes/kubernetes/blob/127c47caf49bec4a59a0500f99b1b1d4cdbf340e/cluster/gce/util.sh#L2922
  It gets executed on master on cluster-up, but it won't be re-executed on master restart.
  
  We should fix that, especially if we're to implement https://github.com/kubernetes/kubernetes/issues/86484
  
  /sig scalability
  /priority important-soon