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>

ipaclient/remote_plugins/schema.py

@@ -95,7 +95,7 @@ class _SchemaObject(Object):
     pass
 
 
-class _SchemaPlugin(object):
+class _SchemaPlugin:
     bases = None
     schema_key = None
 
@@ -352,7 +352,7 @@ class NotAvailable(Exception):
     pass
 
 
-class Schema(object):
+class Schema:
     """
     Store and provide schema for commands and topics