Ignore network domain suffix in hostname

[grtjn]

ML init/bootstrapping adds the network domain suffix to host names automatically, but that often causes trouble in inter-host communication, as hostname+suffix is not always actually recognized by networks. Either /etc/hosts should include names with suffixes (not sure hostmanager supports that), or hostnames should be fixed from bootstrap scripts after init..

[grtjn]

@peetkes found a work-around by changing get_vm_name in Vagrantfile to include domain suffix. A sys-call like cat /etc/resolv.conf | grep domain could determine that dynamically, but that is OS-specific (it runs on the host, not the guest VMs!).

Also, I think there are more benefits from stripping the suffixes from the hostnames inside ML, like when you take your laptop and hook up into a network with a different domain etc. Investigating this route..