Fix issue on kill, process have to consume child output stream or have t...

[xsellier]

Fix issue on kill, process have to consume child output stream or have to waitpid.

If we don't waitpid spawning a new tty session and then kill it will create a bash zombie process.

root 1795 0.2 9.6 104212 48500 ? Sl 01:00 1:39 node /opt/controller-app/lib/index.js
root 2914 0.1 0.0 0 0 ? Zs 13:22 0:00 _ [bash] <defunct>
root 3137 0.2 0.0 0 0 ? Zs 13:24 0:00 _ [bash] <defunct>