Tony Breeds 6bc905c348 Change the restart_rpc_backend loop to accomodate async rabbitmq ...

Some distros have converted to systemd for starting RabbitMQ.  This has
resulted in:
---
[Call Trace]
./stack.sh:904:restart_rpc_backend
/home/stack/projects/openstack/openstack-dev/devstack/lib/rpc_backend:201:die
[ERROR] /home/stack/projects/openstack/openstack-dev/devstack/lib/rpc_backend:201 Failed to set rabbitmq password
Error on exit
World dumping... see /opt/stack/logs/worlddump-2015-05-29-031618.txt for details
---

Because 'restart_service rabbitmq-server' returns before the server is ready to
accept connections.

Alter the retry loop to only restart the rabbitmq-server every second time
through the loop.  Allowing time for the slow rabbit to start.

Closes-Bug: 1449056
Change-Id: Ibb291c1ecfd109f9ed10b5f194933364985cc1ce

2015-06-01 16:23:13 +10:00

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