auth: python3 compatability code for migration

rhodecode/lib/auth.py

@@ -366,7 +366,8 b' class PermOriginDict(dict):'
         dict.__init__(self, *args, **kw)
         self.perm_origin_stack = collections.OrderedDict()
 
-    def __setitem__(self, key, (perm, origin, obj_id)):
+    def __setitem__(self, key, perm_origin_obj_id):
+        (perm, origin, obj_id) = perm_origin_obj_id
         self.perm_origin_stack.setdefault(key, []).append((perm, origin, obj_id))
         dict.__setitem__(self, key, perm)
 
@@ -385,7 +386,8 b' class BranchPermOriginDict(PermOriginDic'
     >>> perms.perm_origin_stack
     {'resource': {'*pattern': [('read', 'default'), ('write', 'admin')]}}
     """
-    def __setitem__(self, key, (pattern, perm, origin)):
+    def __setitem__(self, key, pattern_perm_origin):
+        (pattern, perm, origin) = pattern_perm_origin
 
         self.perm_origin_stack.setdefault(key, {}) \
             .setdefault(pattern, []).append((perm, origin))