Inspired by commit of v12.1.0-37-g25662b3700.
We already have a test case for <interface type='hostdev'/>, but
what we are missing is <interface type='network'/> where the
network is of a <forward mode='hostdev'/>. Apparently, we had a
crasher there too.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>