Comment 2 for bug 1524418

The crux of this issue is really that nova-network is failing to check in after shutdown / restart, which is why it's being seen on grenade jobs only:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message:%5C%22Timed%20out%20waiting%20for%20a%20reply%20to%20message%20ID%5C%22%20AND%20tags:screen-n-net.txt