update rabbitmq reference

This commit updates the ref for rabbit to an earlier revision

While the previous revision worked, it was always enabling the
rabbitmq upstream repos causing the latest version of it to be
installed.

For openstack, we need to use the version supporting by the distros
(and tested with openstack) and not the latest version.

Change-Id: I8f81071929604271c4370019ea15ec7d14ee93fa
Merge "update rabbitmq reference"