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/test/unit/eb/test_eb.py

@@ -3,7 +3,7 @@ import tempfile
 import requests
 import subprocess
 from server.test import PROJECT_ROOT, FIXTURES_ROOT
-from server.common.app_config import AppConfig
+from server.common.config.app_config import AppConfig
 from contextlib import contextmanager
 import time
 
@@ -36,9 +36,7 @@ class Elastic_Beanstalk_Test(unittest.TestCase):
 
         c = AppConfig()
         # test that eb works
-        c.update_server_config(
-            multi_dataset__dataroot=f"{FIXTURES_ROOT}", app__flask_secret_key="open sesame"
-        )
+        c.update_server_config(multi_dataset__dataroot=f"{FIXTURES_ROOT}", app__flask_secret_key="open sesame")
 
         c.complete_config()
         c.write_config(f"{tempdirname}/config.yaml")