Add keystoneclient support for cinder.
Add keystoneclient support for cinder.

Add an ability to ask keystone about users and groups
through keystoneclient in cinder.

blueprint volume-acl

Change-Id: Ice261e9709833d057722b4f13c404df54e10b204

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