Add ability to enable, disable and view team syncing in UI and API

Also extracts out some common testing infrastructure to make testing APIs easier now using pytest

endpoints/api/test/shared.py

@@ -2,15 +2,12 @@ import datetime
 import json
 
 from contextlib import contextmanager
-
 from data import model
 from endpoints.api import api
 
 CSRF_TOKEN_KEY = '_csrf_token'
 CSRF_TOKEN = '123csrfforme'
 
-
-@contextmanager
 def client_with_identity(auth_username, client):
   with client.session_transaction() as sess:
     if auth_username and auth_username is not None: