Search through the libvirt network XML to find the host IP.
Search through the libvirt network XML to find the host IP.

We were hardcoding it to 192.168.122.1, but with current libvirt
that is no longer a safe assumption.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

NeilBryant/oz,imcleod/oz,cernops/oz,imcleod/oz,nullr0ute/oz,ndonegan/oz,moofrank/oz,nullr0ute/oz,clalancette/oz,mgagne/oz,clalancette/oz,NeilBryant/oz,moofrank/oz,mgagne/oz,ndonegan/oz,cernops/oz