LU-14119 osd: delete stale OI mapping entry

LU-14119 osd: delete stale OI mapping entry

Once LMA check shows OI mapping entry is stale, delete it from
OI table, as can avoid removing whole OI files.

Don't add OI mapping into cache until osd_fid_lookup(), because
the mapping in OI is not trustable until FID in LMA is checked,
otherwise it may mislead LFSCK.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I4b50dcc02149d485e4bf4a361ca2994daa280feb
Reviewed-on: https://review.whamcloud.com/41741
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>