Retry service rabbitmq-server status few times before giving up, as rabbitmq can take some time to come up.
e.g. https://jenkins.opencontrail.org/job/ci-contrail-packages-systest-ubuntu-precise-pangolin-havana/12/console
But it did come up after 5 seconds, as reported in /ci-admin/failed_systest_logs/contrail-packages/12/var/log/rabbitmq/rabbit@ci-oc-subslave-ubuntu-10-84-34-144-1.log

Change-Id: Ib4ae0a25a6dca965887773b8a7fbb3e008c47c81
Merge "Retry service rabbitmq-server status few times before giving up, as rabbitmq can take some time to come up. e.g. https://jenkins.opencontrail.org/job/ci-contrail-packages-systest-ubuntu-precise-pangolin-havana/12/console But it did come up after 5 seconds, as reported in /ci-admin/failed_systest_logs/contrail-packages/12/var/log/rabbitmq/rabbit@ci-oc-subslave-ubuntu-10-84-34-144-1.log"