supervisor安装/配置以及错误提示

1. 启动时提示如下：
   Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord.
   解决方法：

   1. 清理缓存
      sudo unlink /tmp/supervisor.sock

      sudo unlink /var/run/supervisor.sock

   2. lsof -i tcp | grep LISTEN
      查看服务进程