Add a subprocess.Popen timeout when possible

[nirizr]

The linux timeout command seems to fail terminating processes occasionally, so when possible without breaking the interface I've added a subprocess.Popen timeout (to be double the linux timeout) as a backup timeout.

This is a bit hackish but has been useful for me.

[vanhauser-thc]

same here, do you want to fix the conflict or me just copying over the changes?

[nirizr]

Fixed the conflict. Thanks!