Fix typo in devstack/stack.sh
Fix typo in devstack/stack.sh

Change-Id: Ie13f1ae7fb5a46bb654aa3ab526933107c485b0b

vishnugonela/devstack,noironetworks/devstack,liuquansheng47/devstack,varunarya10/devstack,vsham20/devstack,andrewrothstein/devstack,atulpatil301/devstack,wenhuizhang/devstack,pczerkas/devstack,flavio-fernandes/devstack,Mahito/devstack,bq-xiao/devstack,nuxeh/devstack,mc2014/devstack,bljgaurav/openstack-test,pczerkas/devstack,nawawi/openstack,kplus/devstack-moonshot,kplus/devstack-moonshot,nawawi/openstack,pacinete/devstack,HPCHub/devstack,nuxeh/devstack,costingalan/devstack,bswartz/devstack,sequenceiq/devstack,HPCHub/devstack,herrsechs/devstack,TwinkleChawla/devstack,upadhyay-prashant/devstack,CloudServer/devstack,rushiagr/devstack,mmasaki/devstack,bq-xiao/devstack,LoHChina/devstack,neerja28/Devstack_GlusterFS,parul24/devstack,ozamiatin/devstack,prithivm/branch01,sequenceiq/devstack,dtroyer/devstack,thomasem/devstack,neerja28/Devstack_GlusterFS,flavio-fernandes/devstack,pacinete/devstack,dirkmueller/devstack,varunarya10/devstack,atulpatil301/devstack,herrsechs/devstack,noironetworks/devstack,mc2014/devstack,openstack-dev/devstack,pombredanne/devstack,Mahito/devstack,mssumanth/devstack,j4/devstack,NaokiMiyata/devstack,avvocatodemarchis/devstack,costingalan/devstack,wenhuizhang/devstack,ozamiatin/devstack,eharney/devstack,pombredanne/devstack,vsham20/devstack,thomasem/devstack,upadhyay-prashant/devstack,avvocatodemarchis/devstack,olivierlemasle/devstack,j4/devstack,dirkmueller/devstack,dtroyer/devstack,rushiagr/devstack,eharney/devstack,bljgaurav/openstack-test,bigswitch/devstack,richliu/devstack,mssumanth/devstack,NaokiMiyata/devstack,TwinkleChawla/devstack,group-policy/devstack,LoHChina/devstack,vishnugonela/devstack,olivierlemasle/devstack,mmasaki/devstack,group-policy/devstack,bigswitch/devstack,andrewrothstein/devstack,bswartz/devstack,openstack-dev/devstack,CloudServer/devstack,prithivm/branch01,liuquansheng47/devstack,samgoon/devstack,richliu/devstack,parul24/devstack,samgoon/devstack