Fix the tests for registry v2 changes.

test/test_gc.py

@@ -68,9 +68,15 @@ class TestGarbageCollection(unittest.TestCase):
         if not image_id in image_map:
           image_map[image_id] = self.createImage(image_id, repo, namespace)
 
+        v1_metadata = {
+          'id': image_id,
+        }
+        if parent is not None:
+          v1_metadata['parent'] = parent.docker_image_id
+
         # Set the ancestors for the image.
         parent = model.image.set_image_metadata(image_id, namespace, name, '', '', '',
-                                                parent=parent)
+                                                v1_metadata, parent=parent)
 
       # Set the tag for the image.
       model.tag.create_or_update_tag(namespace, name, tag_name, image_ids[-1])