docs: def cmd_stop(self, argv, help):
          """Stops the instance"""
          parser = argparse.ArgumentParser(
              prog="%s stop" % self.progname,
              description=help,
          )
          instances = self.get_instances(command='stop')
          parser.add_argument("instance", nargs=1,
                              metavar="instance",
                              help="Name of the instance from the config.",
                              choices=sorted(instances))
          args = parser.parse_args(argv)
          instance = instances[args.instance[0]]
          instance.stop()