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.

Fixed several defects:
- use parent ops instead of child ops in mdo_create();
- skip version get for obf in mdt_obj_version_get();
- disable non-normal fid lookup in obf_lookup();

Signed-off-by: John L. Hammond <jhammond@tacc.utexas.edu>
Signed-off-by: Bob Glossman <bogl@whamcloud.com>
Signed-off-by: Niu Yawei <niu@whamcloud.com>
Change-Id: I89c5b37c822680b0ad1e23372e3e2be464f6a3d8
Reviewed-on: http://review.whamcloud.com/3726
Tested-by: Hudson
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>