Fix upgrading edge-ish case
Fix upgrading edge-ish case

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