Add formatters for 'tags' in method _do_stack_show

This change added json_formatter for 'tags' in method _do_stack_show.

Change-Id: Icdd3c90d237804926657103dcc846f48f4355fde
Closes-Bug: #1536492

heatclient/osc/v1/stack.py

@@ -419,6 +419,7 @@ def _show_stack(heat_client, stack_id, format='', short=False):
             formatters['parameters'] = complex_formatter
             formatters['outputs'] = complex_formatter
             formatters['links'] = complex_formatter
+            formatters['tags'] = complex_formatter
 
         return columns, utils.get_item_properties(data, columns,
                                                   formatters=formatters)

heatclient/tests/unit/test_shell.py

@@ -754,7 +754,8 @@ class ShellTestUserPass(ShellBase):
             "id": "1",
             "stack_name": "teststack",
             "stack_status": 'CREATE_COMPLETE',
-            "creation_time": "2012-10-25T01:58:47Z"
+            "creation_time": "2012-10-25T01:58:47Z",
+            "tags": [u'tag1', u'tag2']
         }}
         resp = fakes.FakeHTTPResponse(
             200,
@@ -777,9 +778,11 @@ class ShellTestUserPass(ShellBase):
             'stack_name',
             'stack_status',
             'creation_time',
+            'tags',
             'teststack',
             'CREATE_COMPLETE',
-            '2012-10-25T01:58:47Z'
+            '2012-10-25T01:58:47Z',
+            "['tag1', 'tag2']",
         ]
         for r in required:
             self.assertRegexpMatches(list_text, r)

heatclient/v1/shell.py

@@ -1575,7 +1575,8 @@ def _do_stack_show(hc, fields):
             'stack_status_reason': utils.text_wrap_formatter,
             'parameters': utils.json_formatter,
             'outputs': utils.json_formatter,
-            'links': utils.link_formatter
+            'links': utils.link_formatter,
+            'tags': utils.json_formatter
         }
         utils.print_dict(stack.to_dict(), formatters=formatters)