task/rados: use new usage for radosmodel tool
task/rados: use new usage for radosmodel tool

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