Revert "NFS: nfs_rename() handle -ERESTARTSYS dentry left behind"

Revert "NFS: nfs_rename() handle -ERESTARTSYS dentry left behind"

This reverts commit bd295d44171b8aba55392edf12d1694a62c428e5 which could
call d_move() without holding the directory's i_mutex, and reverts commit
31065d1611fcb6d2a2d7bed4b779de41da2a569b "NFS: Fix old dentry rehash after
move", which was a follow-up fix.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: bd295d44171b ("NFS: nfs_rename() handle -ERESTARTSYS dentry left behind")
Cc: stable@vger.kernel.org # v4.10+
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>