disable the open source chef server 11 services on reconfigure

This, combined with updated documentation on how to handle the running runsvdir and runsv processes from Chef 11, contribute to address https://github.com/opscode/chef-server/issues/25.

This PR writes a down file into the service directory for each of the Chef Server 11 services, ensuring that they will not start up by default on a node reboot or when the Chef 11 runsvdir process gets restarted.

/cc @opscode/server-team @jeremiahsnapp @stevendanna