Fix Ironic agent ramdisk URL
Fix Ironic agent ramdisk URL

This URL was wrong in the first place, not sure how that happened.

Change-Id: I8a9a19c9776c06d062751becf8382b9a014e45eb

vishnugonela/devstack,group-policy/devstack,ozamiatin/devstack,samgoon/devstack,TwinkleChawla/devstack,olivierlemasle/devstack,flavio-fernandes/devstack,wenhuizhang/devstack,olivierlemasle/devstack,j4/devstack,nawawi/openstack,flavio-fernandes/devstack,wenhuizhang/devstack,dirkmueller/devstack,mc2014/devstack,dtroyer/devstack,NaokiMiyata/devstack,pombredanne/devstack,mmasaki/devstack,bljgaurav/openstack-test,pacinete/devstack,atulpatil301/devstack,LoHChina/devstack,j4/devstack,costingalan/devstack,nawawi/openstack,affo/devstack,CloudServer/devstack,avvocatodemarchis/devstack,mc2014/devstack,LoHChina/devstack,richliu/devstack,nuxeh/devstack,pczerkas/devstack,mssumanth/devstack,varunarya10/devstack,thomasem/devstack,openstack-dev/devstack,parul24/devstack,promptworks/devstack,dirkmueller/devstack,tianweizhang/devstack,bq-xiao/devstack,neerja28/Devstack_GlusterFS,BSJAIN92/OpenStack,atulpatil301/devstack,upadhyay-prashant/devstack,prithivm/branch01,thomasem/devstack,samgoon/devstack,eharney/devstack,liuquansheng47/devstack,bljgaurav/openstack-test,group-policy/devstack,dtroyer/devstack,NaokiMiyata/devstack,herrsechs/devstack,virtualopensystems/devstack,kplus/devstack-moonshot,eharney/devstack,mmasaki/devstack,bswartz/devstack,BSJAIN92/OpenStack,pacinete/devstack,parul24/devstack,CloudServer/devstack,sc68cal/devstack,varunarya10/devstack,mssumanth/devstack,liuquansheng47/devstack,vishnugonela/devstack,prithivm/branch01,noironetworks/devstack,avvocatodemarchis/devstack,upadhyay-prashant/devstack,neerja28/Devstack_GlusterFS,HPCHub/devstack,bigswitch/devstack,andrewrothstein/devstack,richliu/devstack,pczerkas/devstack,kplus/devstack-moonshot,sc68cal/devstack,TwinkleChawla/devstack,andrewrothstein/devstack,rushiagr/devstack,openstack-dev/devstack,eshnil2000/devstack,vsham20/devstack,bigswitch/devstack,affo/devstack,bswartz/devstack,bq-xiao/devstack,tianweizhang/devstack,herrsechs/devstack,ozamiatin/devstack,costingalan/devstack,vsham20/devstack,Mahito/devstack,Mahito/devstack,HPCHub/devstack,noironetworks/devstack,promptworks/devstack,sequenceiq/devstack,rushiagr/devstack,nuxeh/devstack,sequenceiq/devstack,pombredanne/devstack