LU-15581 utils: add check_iam util

LU-15581 utils: add check_iam util

A tool for parsing and checking IAM files.
And a test to check utility works without segfaults for
corrupted files.

To process all files in OI catalog:
for f in /root/md65_ldiskfs/oi.16.*; do
	echo $f; lustre/utils/check_iam -v $f;
done > output.txt 2>&1

Test-Parameters: trivial testlist=conf-sanity env=ONLY=134
HPE-bug-id: LUS-10501
Change-Id: I7a8e83bc2720040e48c953511801816fd3dd6288
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@hpe.com>
Signed-off-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/46575
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Artem Blagodarenko <ablagodarenko@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>