Added unit test configuration in gitlab-ci

This merge adds a unit-test gitlab-CI configuration based on pytest-django.

gracedb/ligoauth/tests/test_middleware.py

@@ -124,6 +124,8 @@ class TestControlRoomMiddleware(GraceDbTestBase):
 
     @classmethod
     def setUpClass(cls):
+        super(TestControlRoomMiddleware, cls).setUpClass()
+
         # Make sure middleware is installed
         if not any(['ControlRoomMiddleware' in m for m in
            settings.MIDDLEWARE]):