Revert "Update used Fedora images to version 21"
Revert "Update used Fedora images to version 21"

This breaks check-heat-dsvm-functional-mysql which assumes the previous glance image name.

This reverts commit 21dbe993348b794a1b77c4f9db0081d1cc32138c.

Change-Id: I77749f3f9f1a64719447ddd25ee95bc6d3afa5b3

costingalan/devstack,j4/devstack,andrewrothstein/devstack,promptworks/devstack,BSJAIN92/OpenStack,pombredanne/devstack,parul24/devstack,LoHChina/devstack,HPCHub/devstack,bljgaurav/openstack-test,sequenceiq/devstack,olivierlemasle/devstack,nuxeh/devstack,wenhuizhang/devstack,ozamiatin/devstack,NaokiMiyata/devstack,mssumanth/devstack,vishnugonela/devstack,herrsechs/devstack,group-policy/devstack,affo/devstack,nawawi/openstack,upadhyay-prashant/devstack,mc2014/devstack,bq-xiao/devstack,atulpatil301/devstack,dirkmueller/devstack,pombredanne/devstack,mc2014/devstack,sequenceiq/devstack,bigswitch/devstack,promptworks/devstack,mssumanth/devstack,CloudServer/devstack,LoHChina/devstack,BSJAIN92/OpenStack,andrewrothstein/devstack,avvocatodemarchis/devstack,parul24/devstack,varunarya10/devstack,openstack-dev/devstack,dtroyer/devstack,Mahito/devstack,HPCHub/devstack,openstack-dev/devstack,avvocatodemarchis/devstack,nuxeh/devstack,thomasem/devstack,noironetworks/devstack,dtroyer/devstack,ozamiatin/devstack,upadhyay-prashant/devstack,pacinete/devstack,group-policy/devstack,costingalan/devstack,noironetworks/devstack,neerja28/Devstack_GlusterFS,kplus/devstack-moonshot,bq-xiao/devstack,sc68cal/devstack,pczerkas/devstack,vsham20/devstack,affo/devstack,neerja28/Devstack_GlusterFS,varunarya10/devstack,samgoon/devstack,rushiagr/devstack,mmasaki/devstack,j4/devstack,prithivm/branch01,herrsechs/devstack,nawawi/openstack,bljgaurav/openstack-test,thomasem/devstack,TwinkleChawla/devstack,dirkmueller/devstack,NaokiMiyata/devstack,flavio-fernandes/devstack,richliu/devstack,flavio-fernandes/devstack,mmasaki/devstack,kplus/devstack-moonshot,Mahito/devstack,wenhuizhang/devstack,rushiagr/devstack,vishnugonela/devstack,bigswitch/devstack,liuquansheng47/devstack,CloudServer/devstack,liuquansheng47/devstack,prithivm/branch01,eharney/devstack,bswartz/devstack,pczerkas/devstack,samgoon/devstack,richliu/devstack,eharney/devstack,olivierlemasle/devstack,vsham20/devstack,pacinete/devstack,bswartz/devstack,TwinkleChawla/devstack,atulpatil301/devstack,sc68cal/devstack