Rename the new images method to a slightly better name

test/test_imagetree.py

@@ -102,7 +102,8 @@ class TestImageTree(unittest.TestCase):
     def checker(index, image):
       return True
 
-    filtered_images = model.get_repository_images_directly(repository, with_ancestor=base_image)
+    filtered_images = model.get_repository_images_without_placements(repository,
+                                                                     with_ancestor=base_image)
     self.assertEquals(set([f.id for f in filtered_images]), set([a.id for a in all_images]))
 
     tree = ImageTree(filtered_images, all_tags)