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/__init__.py

@@ -1,4 +1,3 @@
-
 # import the built in auth types so they can be registered
 
 import server.auth.auth_none  # noqa: F401