Sftp

* [Update] 实现sftp

* [Update] sftp

* [Update] 修改sftp

* [Update]

* [Update] 完成文件上传

需要API支持
api 修改 http.get('/api/terminal/v1/sessions/' + token + '/replay');
该API返回值应修改成
{ id: string, // session id
src: string, // 录像地址，例如/media/2018-04-23/xxxx.gz,
/media/2018-04-23/xxxx.mp4
type: string, // mp4 , json
height: int, // 高度
width: int, // 宽度
}

https://trello.com/c/DYNi38DI/285-windows%E5%BD%95%E5%83%8F%E6%92%AD%E6%94%BE%E5%92%8C%E4%BC%98%E5%8C%96linux%E6%92%AD%E6%94%BE

RuntimeError: dictionary changed size during iteration

this version needs coco support, the websocket re-use. add guacamole component. framework changed