LU-3963 libcfs: cleanup list operations

LU-3963 libcfs: cleanup list operations

Cleanup list operations (libcfs/include/libcfs/list.h)
All typed list operations for the libcfs core are converted
to the kernel APIs.

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: Ibcb92e5133312e8db4fdf2f9fa1b68a8c68a2e74
Reviewed-on: http://review.whamcloud.com/4780
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Peng Tao <bergwolf@gmail.com>