Fixes some typos in stack.sh
Fixes some typos in stack.sh

Change-Id: Ia627d1793c6db76590844d51854dce35a87206b7
Signed-off-by: Gael Chamoulaud <68646863a1a9108d0246eb96cb6356f9fa9a34f3@redhat.com>

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