LU-8703 libcfs: use int type for CPT identification.

LU-8703 libcfs: use int type for CPT identification.

This patch bring the lustre CPT code into alignment with the Linux kernel.

 * use int type for CPT identification like CPU identification.
 * fix coding style.

Change-Id: I5df33f37757eb6d47ab4e824ec1b800a40730f61
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: https://review.whamcloud.com/23304
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>