let machdb client handle all defaults

src/sso_server/sso_server/auth/auth_machdb.py

@@ -10,8 +10,6 @@ from sso_server.auth import AuthBase
 
 log = logging.getLogger(__name__)
 
-MACHDB_URL = os.getenv('MACHDB_URL', 'https://machdb.investici.org:3000')
-
 
 class Updater(threading.Thread):
 
@@ -49,7 +47,7 @@ class Auth(AuthBase):
         logging.getLogger('pyactiveresource').setLevel(logging.ERROR)
 
         # Setup MachDB.
-        mdb.init(MACHDB_URL)
+        mdb.init()
 
         self.auth_cache = {'pwcache': {}, 'grpcache': {}, 'otpcache': {}}
         updater = Updater(self.auth_cache)