network-hotplug-rename: Read network configuration, too
Remove batman-adv zones

BATMAN networks are usually switched and not routed so this
hook is not necessary any more. If you want to route them any
way you can simply create a zone with only one batman-adv port.
Remove support for openvswitch (switch zone hook)

It doesn't work very well any ways and I don't want to
maintain it as it does not give us any real advantage
at the moment.