(maybe we should implement a Config option later because it mostly
just have sense on openvpn servers)
* improved openvpn to use the commands provided by iproute2 if
available instead of using the depreceated ifconfig)
git-svn-id: svn://svn.opensde.net/opensde/package/trunk@20196 10447126-35f2-4685-b0cf-6dd780d3921f