Added missing articles from 0.3

* RabbitMQ additional instance
* Specify SecurityGroups quotas
* Reconfigure rate-limits for Nova
* Configuring Neutron

Closes-bug: #1287131
Change-Id: I694c7e1b95bc1f4fd5424e4190e1dc3ced063b3d
Merge "Added missing articles from 0.3"