Use `fuser` on Linux 

Hi,

You can use [**`fuser`**](https://manpages.debian.org/testing/psmisc/fuser.1.html) to identify and kill processes using port.

```javascript
  return sh(`fuser --kill --namespace ${method} ${port}`)
```

It's installed by default on Ubuntu and OSMC (Linux distribution based on Debian). `lsof` isn't installed by default on OSMC (maybe also on Debian).