Add ability to configure control_exchange

Add control_exchange parameter with default to 'openstack'.

The control_exchange configuration defaults to 'openstack' in Cinder.

Fixes: bug #1220272
Change-Id: Ic15e471a745568e5183ad9eedba92c213026309e
Merge "Add ability to configure control_exchange"
Add ratelimiting parameters to cinder::api

Cinder master now has proper support for ratelimitng via
the api-paste.ini.

This commit adds a configuration option based on
https://github.com/openstack/cinder/commit/2acb6f329bb404e224e525b946c0aa6cdc74040c

Change-Id: I2bdbd5d917baaeaa151471a8b20b2d7939fcf82a
Pin to posgresql 2.5 module

- Later version breaks backward compatibility
- Sort fixtures for better maintainability

Change-Id: I4197041025f5d89a02c83bfee20ef2f2788f756f
Prepping module for 2.2.0 release.

Updated Modulefile to version 2.2.0. Updated README.md with
latest release notes.

Change-Id: I9aab1c3ff9b5f801dd496c4947cba81fe4f879ac
Merge branch 'master' of https://github.com/stackforge/puppet-cinder into havana