switch debian8-canal-ha to ubuntu

roles/kubernetes/master/tasks/main.yml

@@ -52,6 +52,8 @@
 
 - name: Create kube system namespace
   command: "{{ bin_dir }}/kubectl create -f {{kube_config_dir}}/{{system_namespace}}-ns.yml"
+  retries: 4
+  delay: "{{ retry_stagger | random + 3 }}"
   changed_when: False
   when: kubesystem|failed and inventory_hostname == groups['kube-master'][0]
   tags: apps

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