Comment 5 for bug 1649124

Interestingly, this error does occur in our ci runs as well: http://logs.openstack.org/65/409165/4/check-tripleo/gate-tripleo-ci-centos-7-ovb-nonha/ebf8bf0/logs/undercloud/var/log/neutron/openvswitch-agent.txt.gz#_2016-12-13_16_29_24_665

However, it looks like ovs-agent gets restarted immediately after and then works fine.

I think to debug this we would need to see the neutron, nova, and ironic logs to see what interaction is causing the no valid host failures.