write a simple policykit file that allows user to run openvpn
(from redmine: created on 2012-07-21, closed on 2012-07-31, precedes #183 (closed), precedes #304 (closed))
(from redmine: created on 2012-07-21, closed on 2012-07-31, precedes #183 (closed), precedes #304 (closed))