delete nics only if the bridge has no other devices than the vxlan
delete nics only if the bridge has no other devices than the vxlan

TrilliumIT/docker-drouter,TrilliumIT/docker-vxlan-plugin,clinta/docker-vxlan-plugin,TrilliumIT/docker-vxlan-plugin,TrilliumIT/docker-drouter,clinta/docker-vxlan-plugin