LU-16605 lfs: Add -n option to fid2path

LU-16605 lfs: Add -n option to fid2path

Add '-n' option to fid2path to allow printing
only the filename of the file instead of the
whole parent pathname.

Test-case sanity/226d added.

Test-Parameters: trivial testlist=sanity
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ieebd39a1655b4e3ad20cdbb4941dbb44882845f4
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51626
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>