No need for get_parser on QoS list

There are no arguments so there's no need to define the
get_parser function.

Change-Id: Icfa8accf6dbb7f8d1a0472926403b405da3cc611

Author: Steve Martinelli

openstackclient/volume/v1/qos_specs.py

@@ -175,10 +175,6 @@ class ListQos(lister.Lister):
 
     log = logging.getLogger(__name__ + '.ListQos')
 
-    def get_parser(self, prog_name):
-        parser = super(ListQos, self).get_parser(prog_name)
-        return parser
-
     def take_action(self, parsed_args):
         self.log.debug('take_action(%s)', parsed_args)
         volume_client = self.app.client_manager.volume