fix(rackspace): set default region name
fix(rackspace): set default region name

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