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

roles/network_plugin/meta/main.yml

@@ -2,15 +2,23 @@
 dependencies:
   - role: network_plugin/calico
     when: kube_network_plugin == 'calico'
-    tags: calico
+    tags:
+      - calico
+
   - role: network_plugin/flannel
     when: kube_network_plugin == 'flannel'
-    tags: flannel
+    tags:
+      - flannel
+
   - role: network_plugin/weave
     when: kube_network_plugin == 'weave'
-    tags: weave
+    tags:
+      - weave
+
   - role: network_plugin/canal
     when: kube_network_plugin == 'canal'
-    tags: canal
+    tags:
+      - canal
+
   - role: network_plugin/cloud
     when: kube_network_plugin == 'cloud'