Function munge_hostname is more for a domain name (based on an OpenStack tenancy) so lets make that clear
One ends up with a very unexpectedly broken cluster if we use the IP address of the cluster endpoint instead of a cluster's domain_name (as would be specified in the Chef-BCPC Environment file for the OpenStack cluster)
Allow for a CLUSTER_NAME to be used in the Vagrantfile so that multiple clusters can be tested in one OpenStack tenancy