Use a different port number for each live server test case in the registry tests

test/registry_tests.py

@@ -68,11 +68,16 @@ class TestFeature(object):
                            data=json.dumps(dict(value=self.old_value)),
                            headers={'Content-Type': 'application/json'})
 
+_PORT_NUMBER = 5001
+
 class RegistryTestCase(LiveServerTestCase):
   maxDiff = None
 
   def create_app(self):
+    global _PORT_NUMBER
+    _PORT_NUMBER = _PORT_NUMBER + 1
     app.config['TESTING'] = True
+    app.config['LIVESERVER_PORT'] = _PORT_NUMBER
     return app
 
   def setUp(self):