[Libvir] Patch for routed virtual networks

Greetings! The attached patch adds support for having routed virtual networks, in addition to the masquerading setup possible with the "<forward />" stanza. I have added a <route dev="ethX" /> stanza (dev is optional), completely equivalent to the <forward /> stanza. Summary of changes: * Added <route /> stanza to XML parsing/creation * Refactored qemudAddIptablesRules to allow for the routed network type * In iptables.c: * Renamed iptables(.*)ForwardAllowIn to iptables(.*)ForwardAllowRelatedIn, to better reflect their function * Added iptables(.*)ForwardAllowIn functions, that do not require traffic to be related Comments are very much appreciated :-) -- Mads Chr. Olesen <shiyee(a)shiyee.dk&gt; shiyee.dk