Wip/beaker rspec

This should work for now. Note that the default nodeset relies on one having the fission gem installed, a fissionrc file and vmware vms etc. I will make it more portable soonish, as soon as I find out what might work best for automated tests using Jenkins.

These tests are for the packaged VM - they do not modify anything on the VM, and are purely a spot check to ensure the built VMs have the right things in the right places etc.