LU-2675 lod: remove lov and lod stuff from obd.h

LU-2675 lod: remove lov and lod stuff from obd.h

Remove QOS related data structures from obd.h to the
lod_internal.h. Remove the unused functions lov_stripe_md_cmp() and
lov_lum_lsm_cmp(). Remove the declarations of several functions that
no longer exist. Move lov_lum_swab_if_needed() to the one file that
uses it.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I59874eda50aa333e5e991090fa3ac538ff8dc0f3
Reviewed-on: http://review.whamcloud.com/8687
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>