docs: def shutdown(name, wait=False, reboot=False):
      '''
      graceful shutdown sent to the container
      :param wait: should we wait for the shutdown to complete?
      :param reboot: reboot a container, ignores wait
      '''
      if not exists(name):
          raise ContainerNotExists("The container (%s) does not exist!" % name)
      cmd = ['lxc-shutdown', '-n', name]
      if wait:
          cmd += ['-w']
      if reboot:
          cmd += ['-r']
          
      subprocess.check_call(cmd)