fix(rackspace): list alpha and beta channels
fix(rackspace): list alpha and beta channels

joshix/docs,ionave/docs,wli6/docs,bq-xiao/docs,jonboulle/docs,ksmaheshkumar/docs-2,mjg59/docs,coreos/docs,robszumski/docs,jdloft/docs,mischief/coreos-docs,michelleN/docs,atxwebs/docs,skynet/docs,endocode/coreos-docs,marineam/coreos-docs,hkjn/docs-1,iankronquist/docs