See if RabbitMQ really needs to be restarted 3 times

[mcouthon]

From @mcouthon on September 13, 2017 6:29

RabbitMQ is currently the slowest component, largely due to the fact that it takes a long time to start/restart its service, and it is restarted 3 times during its configuration. Maybe some of those aren't necessary

Copied from original issue: mcouthon/cloudify-manager-install#20