LU-6285: o2iblnd: Do not use cpus_weight, it's deprecated

LU-6285: o2iblnd: Do not use cpus_weight, it's deprecated

Replace cpus_weight and for_each_cpu mask with
cpumaskweight and for_each_cpu respectively as per latest kernel guidelines.

Change-Id: I038eb38234c0a209a68ca24c8a860d0e84522c27
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/13954
Tested-by: Jenkins
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>