Added version history to api keys. This needed a bit of change

to create history to handle foreign keys better. There may yet
be a better way of doing this that I have not found yet in sqlalchemy
docs.

tests/app/conftest.py

@@ -201,7 +201,7 @@ def sample_api_key(notify_db,
                    service=None):
     if service is None:
         service = sample_service(notify_db, notify_db_session)
-    data = {'service_id': service.id, 'name': uuid.uuid4()}
+    data = {'service': service, 'name': uuid.uuid4(), 'created_by': service.created_by}
     api_key = ApiKey(**data)
     save_model_api_key(api_key)
     return api_key