Move config provider to _init to decouple from app

remove app references from validators

util/config/validators/validate_signer.py

@@ -1,6 +1,6 @@
 from StringIO import StringIO
 
-from app import config_provider
+from _init import config_provider
 from util.config.validators import BaseValidator, ConfigValidationException
 from util.security.signing import SIGNING_ENGINES
 
@@ -8,7 +8,7 @@ class SignerValidator(BaseValidator):
   name = "signer"
 
   @classmethod
-  def validate(cls, config, user, user_password):
+  def validate(cls, config, user, user_password, app):
     """ Validates the GPG public+private key pair used for signing converted ACIs. """
     if config.get('SIGNING_ENGINE') is None:
       return