LU-2675 lov: remove unused lov obd functions

LU-2675 lov: remove unused lov obd functions

Remove the unused liblustre functions llu_extent_lock,
llu_extent_unlock, and llu_glimpse_callback.

Remove the unused lov functions lov_getattr, lov_setattr, lov_brw,
lov_merge_lvb, lov_punch, lov_sync, lov_enqueue, lov_cancel,
lov_cancel_unused, lov_extent_calc, lov_setstripe, lov_setea,
lov_find_pool, and supporting functions.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I59daa224cfedc9e105a3ebe4d3bacecd5a9aa739
Reviewed-on: http://review.whamcloud.com/5581
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>