Change default volume service to Cinder
Change default volume service to Cinder

  * Modifies stackrc to load Cinder instead of n-vol by default
  * Depends on https://review.openstack.org/#/c/9746/
  * Depends on https://review.openstack.org/#/c/9747/

Change-Id: I1fcb4bd274311d048dee54826b6408e5abb493d2

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