LU-6587 mem: refactor OBD_ALLOC_LARGE marco

LU-6587 mem: refactor OBD_ALLOC_LARGE marco

Always try kmalloc first if that fails then retry
with vmalloc. Change checkpach.pl to indicate the
OBD_FREE_LARGE has deprecated. since it hasn't any
special meaning anymore and just using OBD_FREE
instead of.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I44a002fb855956bb0c4bea0f328679a5f56e4d49
Reviewed-on: http://review.whamcloud.com/14994
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>