LU-3963 lnet: convert cfs_atomic primitives

LU-3963 lnet: convert cfs_atomic primitives

This patch convers all cfs_atomic primitives in lnet/
directory.

Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I81426bd7a8a1a97ea5f198d99193649fbbf5389a
Reviewed-on: http://review.whamcloud.com/7070
Tested-by: Hudson
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>