rest-attach: cleanup interface from OVS before recreating
rest-attach: cleanup interface from OVS before recreating

(or OVS may re-claim it when interface is recreated...)

openstack/networking-bagpipe,openstack/networking-bagpipe-l2,openstack/networking-bagpipe,stackforge/networking-bagpipe-l2,openstack/networking-bagpipe-l2,stackforge/networking-bagpipe-l2