Add small note about Swift.
Add small note about Swift.

Change-Id: Id1c014e6fcdf8e52a5e01e7bacf01a567d25e70a

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