LU-1182 ldiskfs-osd: space accounting support

LU-1182 ldiskfs-osd: space accounting support

Add space accounting support to ldiskfs OSD.

This patch also sets initial attributes in do_create().
mdd_attr_set_internal() from mdd_object_initialize() is kept until
EDQUOT is returned in lquota itself.
Attributes of new inodes are now initialized in osd_object_create().
All LA_MODE bits are now passed to ldiskfs_create_inode().
(original patch from LiWei, see ORI-46)

Signed-off-by: Johann Lombardi <johann@whamcloud.com>
Change-Id: I77a621c76343c2633810bb3cef9859ee30b7b23a
Reviewed-on: http://review.whamcloud.com/3160
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>