Fix a typo in make_cert.sh
Fix a typo in make_cert.sh

Change-Id: I6d4f02edf843f0519c3d0413bb033604a7ec73e9

parul24/devstack,richliu/devstack,pczerkas/devstack,pczerkas/devstack,nawawi/openstack,mc2014/devstack,nawawi/openstack,mssumanth/devstack,costingalan/devstack,Mahito/devstack,atulpatil301/devstack,TwinkleChawla/devstack,dtroyer/devstack,ozamiatin/devstack,avvocatodemarchis/devstack,bswartz/devstack,dirkmueller/devstack,vsham20/devstack,group-policy/devstack,prithivm/branch01,TwinkleChawla/devstack,parul24/devstack,openstack-dev/devstack,bswartz/devstack,prithivm/branch01,bigswitch/devstack,pombredanne/devstack,avvocatodemarchis/devstack,richliu/devstack,bigswitch/devstack,ozamiatin/devstack,pombredanne/devstack,varunarya10/devstack,noironetworks/devstack,atulpatil301/devstack,vsham20/devstack,openstack-dev/devstack,olivierlemasle/devstack,thomasem/devstack,Mahito/devstack,group-policy/devstack,samgoon/devstack,dtroyer/devstack,samgoon/devstack,mc2014/devstack,mssumanth/devstack,dirkmueller/devstack,costingalan/devstack,thomasem/devstack,varunarya10/devstack,olivierlemasle/devstack,noironetworks/devstack