Comment 3 for bug 1821690

Seeing these errors on neutron:

2019-03-25 08:39:06.441 30 ERROR neutron.plugins.ml2.managers [req-6ea12291-2833-4b22-b07c-32c56e597be6 76d3f135dbb946e9a369bc67801a9db1 9147a486efe84d2f8e7a89ec0eaaf9da - default default] Failed to bind port 95429802-e1e3-46bb-ac73-7230d0314132 on host undercloud.localdomain for vnic_type baremetal using segments [{'network_id': '4747ff20-26df-496a-b0fc-31a1ee0e19eb', 'segmentation_id': None, 'physical_network': u'ctlplane', 'id': 'bf9777d8-62ed-4d7d-a48b-226c1da5b28d', 'network_type': u'flat'}]