LU-15581 misc: update .gitignore files

LU-15581 misc: update .gitignore files

Ignore the binary for check_iam utility
in lustre/utils.

Also, ignore more files for commit messages.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I5b11dc2d2f3761f778549a121ac940edeeb70980
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49632
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>