docs: def set_warndays(name, warndays):
      '''
      Set the number of days of warning before a password change is required.
      See man passwd.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' shadow.set_warndays username 7
      '''
      pre_info = info(name)
      if warndays == pre_info['warn']:
          return True
      cmd = 'passwd -w {0} {1}'.format(warndays, name)
      __salt__['cmd.run'](cmd, python_shell=False)
      post_info = info(name)
      if post_info['warn'] != pre_info['warn']:
          return post_info['warn'] == warndays
      return False