need to add service account for kube-dns when using RBAC

[typhoonzero]

Add this line in template

https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/kubedns-controller.yaml.in#L171

then create service account under kube-system namespace:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: kube-dns

[typhoonzero]

And also for v1.6.2 we have to add "get" permission for kube-dns service account:

run kubectl replace -f xxx to update the clusterrole:

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-dns
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  - services
  verbs:
  - list
  - watch
  - get