Enable Nova v3 API
Enable Nova v3 API

The Nova v3 API will be disabled by default after 31164 goes through.
This change explicitly enables the v3 API in the nova config file

Change-Id: I8b4c64b4718fc96d7a928c6fa3a0e8716c7edba1

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