[Fedora-xen] vif-route script seems broken for HVM guests

[W. Michael Petullo]

I am having trouble using the vif-route script with HVM guests. Has
anyone else had problems with this? I poked around vif-route by adding
echo statements, and I documented what I found here:

https://bugzilla.redhat.com/show_bug.cgi?id=1414196