peer: add recovery delay to make test behave
peer: add recovery delay to make test behave

Otherwise it was (very) racy!

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