first pass at minimum Grizzly RabbitMQ settings
secure password and setting the default host and port
minor doc cleanup
Initial commit of openstack-ops-messaging cookbook

This initial commit provides support for an openstack-ops-messaging
cookbook. In this initial release, we provide the capability to install
and configure RabbitMQ. This cookbook is modeled after the
openstack-ops-database cookbook in the way in which it can be utilized.

Included are tests for all recipes and this release supports Ubuntu
only.

Change-Id: I4d799fa46e67e0f2eca2ac8b205f51c07e0df01e