osd_recovery: use --no-cleanup for rados bench
osd_recovery: use --no-cleanup for rados bench

Signed-off-by: Samuel Just <8c40222f34b9721b5d5709d4ed45337913ea1c3e@inktank.com>

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