New way to test orphan objects

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/acls/classes.py

@@ -12,12 +12,6 @@ class ModelPermission(object):
     _proxies = {}
     _registry = {}
 
-    @classmethod
-    def clear(cls):
-        cls._inheritances = {}
-        cls._proxies = {}
-        cls._registry = {}
-
     @classmethod
     def register(cls, model, permissions):
         from django.contrib.contenttypes.fields import GenericRelation