thrashosds: fix timeout when no options are specified
thrashosds: fix timeout when no options are specified

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