Invalidate NOT running processes for the local machine

@fauvel just fyi

```bash
vagrant@www:~/fuboo$ foreman start
06:31:55 jobs.1              | started with pid 5907
06:31:55 stream.1            | started with pid 5909
06:31:55 entertainment.1     | started with pid 5912
06:31:55 maintenance.1       | started with pid 5915
06:31:55 maintenance_local.1 | started with pid 5918
06:31:55 search.1            | started with pid 5922
06:32:00 maintenance.1       | ERROR: Command `maintenance start` still running (process `6835` on host `7f0101`)
06:32:00 maintenance.1       | 
06:32:00 stream.1            | ERROR: Command `stream start-message-synchronization` still running (process `5989` on host `7f0101`)
06:32:00 stream.1            | 
06:32:01 maintenance.1       | exited with code 1
06:32:01 system              | sending SIGTERM to all processes
06:32:01 jobs.1              | terminated by SIGTERM
06:32:01 stream.1            | terminated by SIGTERM
06:32:01 entertainment.1     | terminated by SIGTERM
06:32:01 maintenance_local.1 | terminated by SIGTERM
06:32:01 search.1            | terminated by SIGTERM
```

/cc @tomaszdurka @njam