eip-client should be able to find the openvpn command and use a reasonable default for the management interface so that the eip-client config file is not needed
_part of making the desktop client run using sudo on linux out of the box _
(from redmine: created on 2012-07-30, closed on 2012-08-13, relates #182 (closed), relates #354 (closed), relates #382 (closed))