lftpd.sh: fix output to reflect status

Signed-off-by: Oleg Verych <olecom@gmail.com>
lib/cnl: allow to write any command if can['App.suprolftpd.view.ControlTools']

```js
App.backend.req('/suprolftpd/lib/cnl/do',{ id:'LOOPBACK', cmd: 'ls -la' })
```

Signed-off-by: Oleg Verych <olecom@gmail.com>