This allows containers using OpenRC based services to be configured to
allow open tcp connections to be closed before they are shut down.
This fixes#476.
This allows options to be passed to killall5 by the killprocs script.
This was added so that certain processes will not be killed during
shutdown.
x-Gentoo-Bug: 371625
x-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=371625