Py3: Remove subclassing from object

Python 2 had old style and new style classes. Python 3 has only new
style classes. There is no point to subclass from object any more.

See: https://pagure.io/freeipa/issue/7715
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>

ipapython/install/util.py

@@ -11,7 +11,7 @@ import sys
 import six
 
 
-class from_(object):
+class from_:
     """
     Wrapper for delegating to a subgenerator.