Issue a message to update nodes after updating images

Currently it may be confusing for operators that the image upload
command does not update nodes when uploading new versions of images.
This change adds a reminder to do so.

Change-Id: I834043c559004bbf5eeaf0a611cfa70ff29b7b05
Closes-Bug: #1786970

tripleoclient/tests/v1/overcloud_image/test_overcloud_image.py

@@ -432,6 +432,7 @@ class TestUploadOvercloudImage(TestPluginV1):
         )
 
         self.assertEqual(mock_subprocess_call.call_count, 0)
+        self.assertFalse(self.cmd.updated)
 
     @mock.patch('subprocess.check_call', autospec=True)
     def test_overcloud_create_update_images(self, mock_subprocess_call):
@@ -462,6 +463,7 @@ class TestUploadOvercloudImage(TestPluginV1):
             self.app.client_manager.image.images.update.call_count
         )
         self.assertEqual(mock_subprocess_call.call_count, 2)
+        self.assertTrue(self.cmd.updated)
 
 
 class TestUploadOvercloudImageFull(TestPluginV1):

tripleoclient/v1/overcloud_image.py

@@ -194,6 +194,7 @@ class UploadOvercloudImage(command.Command):
                                                            '',
                                                            image.created_at))
                     )
+                    self.updated = True
                     return None
                 else:
                     print('Image "%s" already exists and can be updated'
@@ -306,6 +307,7 @@ class UploadOvercloudImage(command.Command):
     def take_action(self, parsed_args):
         self.log.debug("take_action(%s)" % parsed_args)
         glance_client_adaptor = self._get_glance_client_adaptor()
+        self.updated = False
 
         if parsed_args.platform and not parsed_args.architecture:
             raise exceptions.CommandError('You supplied a platform (%s) '
@@ -493,3 +495,8 @@ class UploadOvercloudImage(command.Command):
                 os.path.join(parsed_args.http_boot, 'agent.ramdisk'),
                 parsed_args.update_existing
             )
+
+        if self.updated:
+            print('Some images have been updated in Glance, make sure to '
+                  'rerun\n\topenstack overcloud node configure\nto reflect '
+                  'the changes on the nodes')