Add Quantum support: address code review comments
Add Quantum support: address code review comments

(commit 1bfa3d53c1ee74525932b721c2dddd42fc129b8e)

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