LU-6142 misc: update headers in config, debian, rpm

LU-6142 misc: update headers in config, debian, rpm

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

Fix minor style issues with comments in a few files.
Remove `dnl` from m4 files.

Files that are uncertain are left as NOASSERTION
for the license identifier. This makes no claim
about the file. It is used to track files so they
can be addressed later.

https://spdx.github.io/spdx-spec/v2-draft/package-information/#75-package-supplier-field

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I212ce05a4292bbb0d71372d9d75880ce45a219f3
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52106
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>