LU-16382 spec: Declare correct license

LU-16382 spec: Declare correct license

Lustre is primarily licensed under GPL-v2.  Some files claim v2+,
others claim v2-only, but all are consistent with v2.

liblustreapi is LGPL2.1+

So make that explicit in lustre.spec.  All 'kmp' packages are
GPL-v2-only, all the rest add "AND LGPL-2.1-or-later.

The Open Build Service complains that "GPL" is too vague.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I4f10c50a39b5b48fed71b179bc888b0ae144444e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49363
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Aurelien Degremont <degremoa@amazon.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>