Fix dev-quick-start.rst post landing for 9d81333fd0

Fixing:
* Add missing -r option to the pip install command
* Add a step to start rabbitmq-server on fedora/rhel after the
  installation
* Replace the systemctl command with service because RHEL <= 6 doesn't
  use systemd
* auth_strategy option can't be appended at the end of the file and
  should be edited under the [DEFAULT] section
* Remove the trailing space

Change-Id: Id9b8a3e2b8c0358ddfc6693fb0cda410a40a4186
Merge "Fix dev-quick-start.rst post landing for 9d81333fd0"