Fix tests that rely on the ordering of values in a dictionary.

Reviewed in https://codereview.appspot.com/7311096/.
diff --git a/tests/test_discovery.py b/tests/test_discovery.py
index 1c8b706..46d8e33 100644
--- a/tests/test_discovery.py
+++ b/tests/test_discovery.py
@@ -863,7 +863,7 @@
     self.assertTrue(hasattr(new_zoo, 'scopedAnimals'))
     self.assertTrue(callable(new_zoo.scopedAnimals))
 
-    self.assertEqual(zoo._dynamic_attrs, new_zoo._dynamic_attrs)
+    self.assertEqual(sorted(zoo._dynamic_attrs), sorted(new_zoo._dynamic_attrs))
     self.assertEqual(zoo._baseUrl, new_zoo._baseUrl)
     self.assertEqual(zoo._developerKey, new_zoo._developerKey)
     self.assertEqual(zoo._requestBuilder, new_zoo._requestBuilder)