test vpn service on a single node on kvm/virtualbox without vagrant
(from redmine: created on 2014-09-23, closed on 2014-11-19, relates #861 (closed), relates #6005 (closed), relates #6376, relates #6388 (closed), blocks #6304 (closed))
(from redmine: created on 2014-09-23, closed on 2014-11-19, relates #861 (closed), relates #6005 (closed), relates #6376, relates #6388 (closed), blocks #6304 (closed))