LU-16692 osp: osp_fid_diff vs rollover_new_seq race

LU-16692 osp: osp_fid_diff vs rollover_new_seq race

osp_fid_diff/osp_objs_precreated is accessing the
last_created_fid and pre_used_fid without opd_pre_lock,
and this could race with osp_precreate_rollover_new_seq()
when updating them to new fids.

Change-Id: I3a61c99570b5532776ddc43247c1513b8c89fb32
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54087
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>