Reference Havana Vagrant Deployment

For the Havana release we need to provide a working example reference deployment for testing and as an example for new users, on Vagrant at the very least. From the openstack-chef-repo the TESTING.md outlines how to use Vagrant to stand up a single "allinone-compute" deployment. That is not currently working for Havana and needs to get to a known working state with a Berksfile, Berksfile.lock, Vagrantfile and vagrant.rb environment that supports it. This configuration needs to be fixed and the deployment it provides documented.

Once we have a working reference implementation, we should continue to make further examples. The same stacks on different operating systems, hypervisors, databases, networking configurations (nova-network, neutron OVS flat/GRE, etc.), storage options (LVM, Ceph, Swift). Having a suite of Vagrant deploys will lend itself to future integration suites and eventually help move to multi-node tests.

But first we need to get the Vagrant allinone-compute working again for Havana.