LU-1518 mdd: Fixup mdd_{obf,dot_lustre}_obj_ops.

LU-1518 mdd: Fixup mdd_{obf,dot_lustre}_obj_ops.

Define several missing md_object ops for .lustre/fid.  Unify
attribute handling for .lustre with that of normal md_objects.

Change-Id: I892904af4ef01b3687e60a41250b018d67c86734
Signed-off-by: John L. Hammond <jhammond@tacc.utexas.edu>
Reviewed-on: http://review.whamcloud.com/3103
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: wangdi <di.wang@whamcloud.com>
Reviewed-by: Lai Siyao <laisiyao@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>