LU-5969 lnet: use LGPL-2.1+ for SPDX headers

LU-5969 lnet: use LGPL-2.1+ for SPDX headers

The change from explicit LGPL license text to SPDX headers
introduced a number of incorrect license identifiers, because
the "or (at your option) any later version" text was missed.

Convert remaining library license blocks over to SPDX LGPL-2.1+.
Reorder copyright and file description to be consistent.
Remove filenames explicitly listed in the header block.

Test-Parameters: trivial
Fixes: e6aefbfaa6 ("LU-6142 libcfs: SPDX for libcfs module")
Fixes: 56a9ba02ae ("LU-6142 libcfs: SPDX for libcfs headers")
Fixes: c9a7728476 ("LU-6142 lnet: SPDX for lnet/include/ and misc files")
Fixes: 9e3fd9ce8f ("LU-6142 lnet: SPDX for lnet/util/lnetconfig/")
Fixes: 0f39311369 ("LU-6142 lnet: SPDX for lnet/utils/")
Fixes: 14e981db6c ("LU-6142 misc: SPDX for Lustre headers")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ic2e9f70f82211ce5231c12d431ca63dc163ebbe5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59367
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Guillaume Courrier <guillaume.courrier@cea.fr>
Reviewed-by: Cory Spitz <cory.spitz@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>