switch debian8-canal-ha to ubuntu

roles/kubernetes/master/tasks/pre-upgrade.yml

@@ -95,5 +95,13 @@
   delegate_to: "{{item}}"
   with_items: "{{groups['etcd']}}"
   when: needs_etcd_migration|bool
-  notify: "Master | reload kubelet"
+
+- name: "Pre-upgrade | restart kubelet on all masters"
+  service:
+    name: kubelet
+    state: restarted
+  delegate_to: "{{item}}"
+  with_items: "{{groups['kube-master']}}"
+  register: kube_apiserver_manifest_replaced
+  when: needs_etcd_migration|bool