Workaround Cinder "wishlist" bug 1255593 for multi-backend volume_clear
Workaround Cinder "wishlist" bug 1255593 for multi-backend volume_clear

Cinder currently only applies the volume_clear setting from the DEFAULT
section of cinder.conf if you're using a single backend.

The Cinder team has determined this is a 'wishlist' item to propagate
volume_clear to each backend, but it does impact usability and
performance.

To improve the performance of running Tempest with multi-backends in the
gate, workaround the bug in devstack.

Related-Bug: #1255593

Change-Id: Ia0ff5422f53eeda9a3ac4336eefec3b9bdea6da2

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