Move config provider to _init to decouple from app

remove app references from validators

util/config/validators/validate_redis.py

@@ -6,7 +6,7 @@ class RedisValidator(BaseValidator):
   name = "redis"
 
   @classmethod
-  def validate(cls, config, user, user_password):
+  def validate(cls, config, user, user_password, app):
     """ Validates connecting to redis. """
     redis_config = config.get('BUILDLOGS_REDIS', {})
     if not 'host' in  redis_config: