code: def subcmd_list_parser(subcmd):
      
      subcmd.add_argument(
          '--broker',
          action='store',
          dest='broker',
          help=u'Route to the Ansible Service Broker'
      )
      subcmd.add_argument(
          '--secure',
          action='store_true',
          dest='verify',
          help=u'Verify SSL connection to Ansible Service Broker',
          default=False
      )
      subcmd.add_argument(
          '--ca-path',
          action='store',
          dest='cert',
          help=u'CA cert to use for verifying SSL connection to Ansible Service Broker',
          default=None
      )
      subcmd.add_argument(
          '--verbose',
          '-v',
          action='store_true',
          dest='verbose',
          help=u'Output verbose spec information from Ansible Service Broker',
          default=False
      )
      subcmd.add_argument(
          '--output',
          '-o',
          action='store',
          dest='output',
          help=u'Specify verbose output format in yaml (default) or json',
          default='optional',
          choices=['yaml', 'json']
      )
      subcmd.add_argument(
          '--username',
          '-u',
          action='store',
          default=None,
          dest='basic_auth_username',
          help=u'Specify the basic auth username to be used'
      )
      subcmd.add_argument(
          '--password',
          '-p',
          action='store',
          default=None,
          dest='basic_auth_password',
          help=u'Specify the basic auth password to be used'
      )
      return
docs: list subcommand