roles/3-simple: include a standby mds
roles/3-simple: include a standby mds

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