configure mds's with -s suffix as standby
configure mds's with -s suffix as standby

zhouyuan/teuthology,ivotron/teuthology,yghannam/teuthology,robbat2/teuthology,dmick/teuthology,caibo2014/teuthology,t-miyamae/teuthology,zhouyuan/teuthology,dmick/teuthology,caibo2014/teuthology,tchaikov/teuthology,michaelsevilla/teuthology,dreamhost/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,dreamhost/teuthology,michaelsevilla/teuthology,yghannam/teuthology,ivotron/teuthology,ceph/teuthology,t-miyamae/teuthology,SUSE/teuthology,SUSE/teuthology,tchaikov/teuthology,dmick/teuthology,ceph/teuthology,robbat2/teuthology,SUSE/teuthology