Comment 10 for bug 1289200

As far as I can see from the related oslo.bug and aforementioned comments (https://bugs.launchpad.net/oslo.messaging/+bug/856764/comments/19) and from zendesk solutions for nova-compute troubleshooting (#1743), the first steps to address this issue should be:
1) TCP KA for Rabbit cluster (comments/19)
2) address use running_deleted_instance_action=reap for nova conf (#1743 and http://lists.openstack.org/pipermail/openstack-dev/2013-October/016153.html)