Move config provider to _init to decouple from app

remove app references from validators

util/config/validators/validate_timemachine.py

@@ -9,7 +9,7 @@ class TimeMachineValidator(BaseValidator):
   name = "time-machine"
 
   @classmethod
-  def validate(cls, config, user, user_password):
+  def validate(cls, config, user, user_password, app):
     if not 'DEFAULT_TAG_EXPIRATION' in config:
       # Old style config
       return