mds: journal renamed dirino on rmdir
mds: journal renamed dirino on rmdir

This makes replay work on the auth by updating the subtrees accordingly
(since rmdir is really just renaming into the stray dir).

Note that this doesn't completely fix things for the dirfrag auth; see
#1295.

Signed-off-by: Sage Weil <c5b6ff1fd4f0bde10db63d7a3e07166cf6c4229f@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph