rountrip: add task
rountrip: add task

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