Fix RabbitMQ service installation and initialization

Fix RabbitMQ service installation and initialization

RabbitMQ service added in [1] is not correctly installed and initialized:
- There is an error during the installation process ("\" character
  missing).
- In the installation script, the service needs to be started first.
- In the container installation, the service needs to be started via
  supervisor.

[1]https://gerrit.opnfv.org/gerrit/#/c/53597/

JIRA: YARDSTICK-1103

Change-Id: Iade3d6ce4b522e6f576af71b7afe5559081f7929
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>