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
Split halt.sh into halt, killprocs, romount and savecache services.
The reboot runlevel is removed but mapped to shutdown.
The halt script should be moved to the sysvinit package.