Avoid duplicate "/tokens" path in auth_url.
Avoid duplicate "/tokens" path in auth_url.

The "/tokens" path is explicitly appended to the OS_AUTH_URL
by the configure_tempest.sh tool, but this is also appended
internally by glance:

  https://github.com/openstack/glance/blob/master/glance/common/auth.py#L111

leading to a duplicated "/tokens/tokens" path.

Change-Id: I2ea49289f7e1976346eff220dc3d1664bdad4fb0

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