Comment 2 for bug 1600546

My initial reading of this is that if we are setting up juju-br0 etc we should not be setting up lxdbr0 because there isn't anything that will be using it. There may still be places where we haven't moved over to setting up juju-br0, and we'll need some sort of bridging, but we should be moving to setting up a bridge-per-host-interface and not having to configure a separate 'lxdbr0' bridge (none of the containers we create would be using it).