ceph-object-corpus: pick up changes to drop backward compatibility

to drop backward compatibility of EMetaBlob

see also https://github.com/ceph/ceph-object-corpus/pull/12

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/ceph-object-corpus b/ceph-object-corpus
index c24e498b76e74a7d23ffe2e715abe38026bd627c..45eaee4bb8756c0bcc8120b4b6efb43766b0116e 160000 (submodule)
--- a/ceph-object-corpus
+++ b/ceph-object-corpus
@@ -1 +1 @@
-Subproject commit c24e498b76e74a7d23ffe2e715abe38026bd627c
+Subproject commit 45eaee4bb8756c0bcc8120b4b6efb43766b0116e