Separate Puppet Modules into a Different Repo

Currently COI uses two apt repos: the main Cisco repository and a supplemental repository. The main repo contains packages of puppet modules, openstack components, and their build dependencies. We've been asked to do a slightly cleaner separation by moving the Puppet modules into a third repo. This would allow folks to use puppet_openstack_builder with custom core component packages (e.g. their own version of Nova, or perhaps Ubuntu Cloud Archive's version, etc) while still using our puppetry to get the cloud installed.