Add test for object source marked down
Add test for object source marked down

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