unittest to cover the case fixed by commit 0aae28a71229ef7a3a7f04e528bbdd536554a9f1
unittest to cover the case fixed by commit 0aae28a71229ef7a3a7f04e528bbdd536554a9f1

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