Vagrant-based test harness

When factoring this module out of aegir-up, I built a simple Vagrant-base test harness. This is a basic Vagrant project (i.e., Vagrantfile, manifests/base.pp) that includes the various modules required for puppet-aegir to work (i.e., puppet-drush, puppet-apt, shared-common).

It seems like this would be useful to keep around. I'm thinking of committing it to a new branch, and then use subtree merges to include the other req'd modules. This would be similar to what I've done with aegir-up, only stripped down to the bare minimum.

Thoughts?