tests: Update to Rackspace live tests. Images and minor.

* 'Ubuntu 11.0' tests to 'Ubuntu 13'. Rackspace no longer has any Ubuntu 11 images.
* 'CentOS 5.6' tests to 'CentOS 5'. Rackspace no longer has any CentOS 5.6 images.
* 'Fedora 17' tests to 'Fedora '. Rackspace no longer has any Fedora 17 images.
* 'CentOS 6.0' tests to 'CentOS 6 '. Rackspace no longer has any CentOS 6.0 images.
* Updated tests to reflect changes to brooklyn.properties naming conventions.

NB: Minor version numbers have been omitted to increase the longevity of the tests.