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.

these seem redundant. If file doesn't match the regex, do we care if it's in the listing?