Adding the Hong Kong region for Rackspace Cloud Queues.

https://issues.apache.org/jira/browse/JCLOUDS-340

Can we get this in for 1.7.0?

To run live tests:

    mvn -Plive -Dtest.rackspace-cloudqueues-us.identity=[username] -Dtest.rackspace-cloudqueues-us.credential=[apikey] -Dtest.rackspace-cloudqueues-us.zone=HKG clean install