LU-6142 lnet: SPDX for lnet/util/lnetconfig/

LU-6142 lnet: SPDX for lnet/util/lnetconfig/

Convert from verbose license text to SDPX.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I25c57a0db2554f551bda0b9b5f6c03893ff83646
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54172
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>