Merge "CoreDNS support EndpointSlices"

Author: Zuul

magnum/drivers/common/templates/kubernetes/fragments/core-dns-service.sh

@@ -40,6 +40,13 @@ rules:
   - nodes
   verbs:
   - get
+- apiGroups:
+  - discovery.k8s.io
+  resources:
+  - endpointslices
+  verbs:
+  - list
+  - watch
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding