JCLOUDS-646: Refactor openstack-common

This PR provides the necessary changes for [JCLOUDS-646](https://issues.apache.org/jira/browse/JCLOUDS-646). This is essentially is a copy/paste/rename of the misnamed keystone packages in `openstack-common` to the `rackspace-cloudidentity` project.

A follow-up PR is required to change the `cloudservers` auth dependencies from `openstack-common` to `rackspace-cloudidentity`.