ceph-object-corpus: revert accidental revert

from 5df3024d7847950672169069b9dc8c8dcb876019

Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/ceph-object-corpus b/ceph-object-corpus
index 0655429f62bc3366250496da3513abec15c34856..84a153afa71c4468c7a3d78270af6415d0a1c3e7 160000 (submodule)
--- a/ceph-object-corpus
+++ b/ceph-object-corpus
@@ -1 +1 @@
-Subproject commit 0655429f62bc3366250496da3513abec15c34856
+Subproject commit 84a153afa71c4468c7a3d78270af6415d0a1c3e7