ceph-object-corpus: revert rewind

From 92becb696bde7f0aa9687b2fe7505ed1ac9f493b

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

diff --git a/ceph-object-corpus b/ceph-object-corpus
index 0b8475d5cbd442b6c2660a9ec45add80a23e26a3..17d4afca1c84f5471c2824876099fef456a3209d 160000 (submodule)
--- a/ceph-object-corpus
+++ b/ceph-object-corpus
@@ -1 +1 @@
-Subproject commit 0b8475d5cbd442b6c2660a9ec45add80a23e26a3
+Subproject commit 17d4afca1c84f5471c2824876099fef456a3209d