LU-15626 lnet: fix shellcheck warning for lnet utils

LU-15626 lnet: fix shellcheck warning for lnet utils

Fix two small shellcheck warnings for
lnetunload.

Update the file headers to have the
SPDX license and use the standard
format.

Move spaces to tabs.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Ic21d917b5b4d6ba6b679453bd50a7699f9908267
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50244
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>