fix(user_list.html & juser/views.py): only for user delete sshkey when downloaded, add generate butt

https://github.com/jumpserver/jumpserver/issues/62

issue:62

当用户未被授予任何角色/主机权限时，提示用户
根据用户实际安装路径，替换启动脚本中connect.py的路径
修正几处拼写错误

添加本地mysqld自启动服务

需要运行python manage.py crontab add来添加

运行 python manage.py crontab remove 来去掉

crontab -l

添加数据库自启动服务。修复服务器重启后./server.sh start 会提示错误——“Starting jumpsever
service:run_websocket.py not running”

2. 根据用户实际安装路径，替换启动脚本中connect.py的路径
3. 修正几处拼写错误

监控支持 ssl

handler is undefined.

Https support

Get SSH client IP address from environment

fix wss issue when using https  #37 支持 wss 和 https