config refactor (#1854)

* split out config

* add tests for base and app config, refactor client config out of app config

* refactor default config retrieval

* create config test class and helper functions

* move default_config into server to fix import issue

server/auth/auth.py

@@ -76,7 +76,7 @@ class AuthTypeFactory:
 
     @staticmethod
     def register(name, auth_type):
-        assert(issubclass(auth_type, AuthTypeBase))
+        assert issubclass(auth_type, AuthTypeBase)
         AuthTypeFactory.auth_types[name] = auth_type
 
     @staticmethod