LU-6142 build: match lnet comment style to linux net layer

LU-6142 build: match lnet comment style to linux net layer

The network layer of the linux kernel has a comment style of

/* and in the future LNet will be placed in the Linux network
 * subsystem which means this comment format will be required.
 */

Test-Parameters: trivial
Change-Id: Ia3584662954c529b4fb72ab4515f3888d8d64072
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/38223
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>