simplify uec image url parsing
simplify uec image url parsing

flavio-fernandes/devstack,varunarya10/devstack,thomasem/devstack,dirkmueller/devstack,bq-xiao/devstack,mc2014/devstack,mssumanth/devstack,cloudbuilders/devstack,vishnugonela/devstack,sc68cal/devstack,atulpatil301/devstack,sequenceiq/devstack,JioCloud/devstack,nuxeh/devstack,ewindisch/raspi-devstack,nawawi/openstack,olivierlemasle/devstack,rushiagr/devstack,eharney/devstack,williamthegrey/devstack,thomasem/devstack,LoHChina/devstack,ozamiatin/devstack,ykaneko/devstack,j4/devstack,jamielennox/devstack,pczerkas/devstack,dirkmueller/devstack,kplus/devstack-moonshot,atulpatil301/devstack,vsham20/devstack,savi-dev/devstack,citrix-openstack-build/devstack,r-mibu/devstack,nawawi/openstack,LoHChina/devstack,mmasaki/devstack,varunarya10/devstack,tianweizhang/devstack,promptworks/devstack,pacinete/devstack,NaokiMiyata/devstack,herrsechs/devstack,ykaneko/devstack,shootstar/devstacktest,Juniper/devstack,nati/devstack_public,affo/devstack,sequenceiq/devstack,Yuriy-Leonov/devstack,avvocatodemarchis/devstack,kplus/devstack-moonshot,r-mibu/devstack,samgoon/devstack,flavio-fernandes/devstack,wenhuizhang/devstack,bswartz/devstack,pacinete/devstack,andrewrothstein/devstack,deepakselvaraj/devstack,mmasaki/devstack,BSJAIN92/OpenStack,noironetworks/devstack,virtualopensystems/devstack,cloudbuilders/devstack,group-policy/devstack,bigswitch/devstack,BSJAIN92/OpenStack,savi-dev/devstack,parul24/devstack,tianweizhang/devstack,richliu/devstack,promptworks/devstack,armando-migliaccio/devstack,nati/devstack_public,ewindisch/raspi-devstack,srics/devstack,mssumanth/devstack,bswartz/devstack,neerja28/Devstack_GlusterFS,pombredanne/devstack,CloudServer/devstack,j4/devstack,affo/devstack,noironetworks/devstack,inkerra/devstack,citrix-openstack-build/devstack,upadhyay-prashant/devstack,costingalan/devstack,NaokiMiyata/devstack,vishnugonela/devstack,prithivm/branch01,HPCHub/devstack,bljgaurav/openstack-test,pombredanne/devstack,ozamiatin/devstack,eharney/devstack,herrsechs/devstack,nuxeh/devstack,innodee/openstackk,sc68cal/devstack,openstack-dev/devstack,HPCHub/devstack,bigswitch/devstack,sstrato/devstack,upadhyay-prashant/devstack,CloudServer/devstack,eshnil2000/devstack,samgoon/devstack,nttmcl/devstack_public,Millnert/contrail-devstack,yamt/devstack,nttmcl/devstack_public,costingalan/devstack,bq-xiao/devstack,neerja28/Devstack_GlusterFS,pczerkas/devstack,parul24/devstack,dtroyer/devstack,Mahito/devstack,rushiagr/devstack,dtroyer/devstack,mc2014/devstack,liuquansheng47/devstack,avvocatodemarchis/devstack,andrewrothstein/devstack,group-policy/devstack,bljgaurav/openstack-test,openstack-dev/devstack,liuquansheng47/devstack,prithivm/branch01,vsham20/devstack,Mahito/devstack,wenhuizhang/devstack,TwinkleChawla/devstack,TwinkleChawla/devstack,CiscoSystems/devstack,olivierlemasle/devstack,richliu/devstack