Enable the libvirt_bridge detection code.
Enable the libvirt_bridge detection code.

Unset the bridge_name by default in the configuration
code so that we actually do bridge detection.

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

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