LU-18112 mdt: check for fid from a client to match format

LU-18112 mdt: check for fid from a client to match format

Access to /mnt/lustre/.lustre/fid/0x200000 passes sane checks

Change-Id: I748e519b56cce6809285bbe178e89f5872a46188
HPE-bug-id: LUS-12448
Signed-off-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55947
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>