CI -- Jobs some times fail due to openstack-nova-compute 'dead'

e.g. https://jenkins.opencontrail.org/job/ci-contrail-server-manager-systest-ubuntu-precise-pangolin-havana/231/console

2015-01-13 18:40:01 /usr/local/jenkins/slave_scripts/contrail-systest-job.rb:508:in `upto'() /usr/local/jenkins/slave_scripts/contrail-systest-job.rb:508:in `verify_contrail'() ssh ci-oc-subslave-ubuntu-10-84-35-136-1.localdomain.com openstack-status:
2015-01-13 18:40:03 == Nova services ==
2015-01-13 18:40:04 openstack-nova-api: active
2015-01-13 18:40:05 openstack-nova-compute: dead
2015-01-13 18:40:05 openstack-nova-network: inactive (disabled on boot)
2015-01-13 18:40:05 openstack-nova-scheduler: active
2015-01-13 18:40:05 openstack-nova-volume: inactive (disabled on boot)
2015-01-13 18:40:06 openstack-nova-conductor: active
2015-01-13 18:40:06 == Glance services ==
2015-01-13 18:40:07 openstack-glance-api: active
2015-01-13 18:40:08 openstack-glance-registry: active
2015-01-13 18:40:08 == Keystone service ==
2015-01-13 18:40:09 openstack-keystone: active
2015-01-13 18:40:09 == Cinder services ==
2015-01-13 18:40:10 openstack-cinder-api: active
2015-01-13 18:40:10 openstack-cinder-scheduler: active
2015-01-13 18:40:10 openstack-cinder-volume: inactive (disabled on boot)
2015-01-13 18:40:10 == Support services ==
2015-01-13 18:40:10 mysql: inactive (disabled on boot)
2015-01-13 18:40:11 libvirt-bin: active
2015-01-13 18:40:11 rabbitmq-server: active
2015-01-13 18:40:11 memcached: inactive (disabled on boot)
2015-01-13 18:40:11 == Keystone users ==

VM logs at /ci-admin/failed_systest_logs/ci-contrail-server-manager-systest-ubuntu-precise-pangolin-havana/231/.

Problem is likely with the AMQP server. nova-compute cannot talk to nova-conductor, which cannot talk to AMQP Server

tail /build/ci-admin/failed_systest_logs/ci-contrail-server-manager-systest-ubuntu-precise-pangolin-havana/231/var/log/nova/nova-conductor.log
2015-01-13 18:27:13.865 27590 ERROR nova.openstack.common.rpc.common [-] AMQP server on 192.168.255.180:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 21 seconds.
2015-01-13 18:27:34.671 27591 INFO nova.openstack.common.rpc.common [-] Reconnecting to AMQP server on 192.168.255.180:5672
2015-01-13 18:27:34.685 27591 INFO nova.openstack.common.rpc.common [-] Connected to AMQP server on 192.168.255.180:5672
2015-01-13 18:27:34.868 27590 INFO nova.openstack.common.rpc.common [-] Reconnecting to AMQP server on 192.168.255.180:5672
2015-01-13 18:27:34.884 27590 INFO nova.openstack.common.rpc.common [-] Connected to AMQP server on 192.168.255.180:5672
2015-01-13 18:27:43.600 27591 INFO nova.openstack.common.rpc.common [req-3f467fa6-f21c-4206-92e8-5e6941f10eea None None] Connected to AMQP server on 192.168.255.180:5672
2015-01-13 18:28:23.839 27591 WARNING nova.openstack.common.loopingcall [-] task run outlasted interval by 29.133822 sec
2015-01-13 18:28:23.841 27590 WARNING nova.openstack.common.loopingcall [-] task run outlasted interval by 28.937576 sec
2015-01-13 18:28:53.440 27591 WARNING nova.openstack.common.loopingcall [-] task run outlasted interval by 19.142471 sec
2015-01-13 18:29:00.134 27590 INFO nova.openstack.common.rpc.common [req-bcc70916-216d-4332-afb3-3d46ef2ca7c2 None None] Connected to AMQP server on 192.168.255.180:5672