Configure vagrant for multiple VMs

Adds VM blocks for centos, ubuntu-12.04 and ubuntu-14.04, along with some basic shared installation steps. All machines have go installed and are able to build inspeqtor. The end goal is to use the vms for testing against each of the services.

I've been working off of this branch while troubleshooting. It would be helpful to update the Vagrantfile on master with one that supports multiple VMs.