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>

ipalib/cli.py

@@ -704,7 +704,7 @@ class help(frontend.Local):
     """
     Display help for a command or topic.
     """
-    class Writer(object):
+    class Writer:
         """
         Writer abstraction
         """
@@ -1082,7 +1082,7 @@ cli_application_commands = (
 )
 
 
-class Collector(object):
+class Collector:
     def __init__(self):
         object.__setattr__(self, '_Collector__options', {})