Enable to update Lables for cluster template

This patch enables to update Labels for cluster template.
This patch should be cherry-picked into stable/queens.

Change-Id: Ie1bfcca8e7a8fd848972d082effff24b21ea3795
Closes-Bug: #1638863

magnum_ui/api/magnum.py

@@ -80,10 +80,6 @@ def _create_patches(old, new):
     patch = []
 
     for key in new:
-        if key == 'labels':
-            # NOTE(shu-mutou): labels for cluster template and cluster
-            # are not updatable.
-            continue
         path = '/' + key
         if key in old and old[key] != new[key]:
             if new[key] is None or new[key] is '':
@@ -95,14 +91,14 @@ def _create_patches(old, new):
             patch.append({'op': 'add', 'path': path, 'value': new[key]})
 
     for key in old:
-        if key == 'labels':
-            # NOTE(shu-mutou): labels for cluster template and cluster
-            # are not updatable.
-            continue
         path = '/' + key
         if key not in new:
             patch.append({'op': 'remove', 'path': path})
 
+    # convert dict value for labels into string
+    for p in patch:
+        if 'value' in p:
+            p['value'] = str(p['value'])
     return patch
 
 

magnum_ui/static/dashboard/container-infra/cluster-templates/workflow/workflow.service.js

@@ -441,9 +441,7 @@
                       htmlClass: 'col-xs-12',
                       items: [
                         {
-                          key: 'labels',
-                          // fixme: to be available, needs to fix bug/1638863
-                          readonly: action === 'update'
+                          key: 'labels'
                         }
                       ]
                     }