Pylint: enable check for unused-variables

Unused variables may:
* make code less readable
* create dead code
* potentialy hide issues/errors

Enabled check should prevent to leave unused variable in code

Check is locally disabled for modules that fix is not clear or easy or have too many occurences of
unused variables

Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipalib/frontend.py

@@ -40,6 +40,8 @@ from ipalib import errors, messages
 from ipalib.request import context, context_frame
 from ipalib.util import classproperty, json_serialize
 
+# pylint: disable=unused-variable
+
 if six.PY3:
     unicode = str