CS12rc6 upgrade of OSC 11.1.4 leaves OSC's runsvdir tree running

Ref: https://github.com/opscode/chef-server/issues/25

This is the cleanest way to properly shutdown the Open Source Chef
Server runsvdir tree and ensure that its init script is removed.

I tested this and it works for me.
I believe that this will fail on CentOS 5 since the `initctl` executable doesn't exist.