LU-20 kernel: add descriptions to kernel patches

LU-20 kernel: add descriptions to kernel patches

Add some descriptive text to kernel patches so that it is more clear
what the patches are needed for, and whether they can simply be
dropped, or if they should be pushed upstream.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ie19de1feedc8bedeb7ae890886aab73815500c1e
Reviewed-on: http://review.whamcloud.com/4613
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Keith Mannthey <kemannthey@gmail.com>