Normalize tags in all places to prepare for tag fixing in future (#1739)

roles/kubernetes/master/tasks/main.yml

@@ -1,6 +1,7 @@
 ---
 - include: pre-upgrade.yml
-  tags: k8s-pre-upgrade
+  tags:
+    - k8s-pre-upgrade
 
 # upstream bug: https://github.com/kubernetes/kubeadm/issues/441
 - name: Disable kube_basic_auth until kubeadm/441 is fixed
@@ -18,12 +19,16 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   changed_when: false
-  tags: [hyperkube, kubectl, upgrade]
+  tags:
+    - hyperkube
+    - kubectl
+    - upgrade
 
 - name: Install kubectl bash completion
   shell: "{{ bin_dir }}/kubectl completion bash >/etc/bash_completion.d/kubectl.sh"
   when: ansible_os_family in ["Debian","RedHat"]
-  tags: kubectl
+  tags:
+    - kubectl
 
 - name: Set kubectl bash completion file
   file:
@@ -32,7 +37,9 @@
     group: root
     mode: 0755
   when: ansible_os_family in ["Debian","RedHat"]
-  tags: [kubectl, upgrade]
+  tags:
+    - kubectl
+    - upgrade
 
 - task: Include kubeadm setup if enabled
   include: kubeadm-setup.yml