LU-15133 osp: only deactivate OSP on LAST_FID error

LU-15133 osp: only deactivate OSP on LAST_FID error

ofd_get_info_hdl() should return -EFAULT upon LAST_FID error, which
is the same as LAST_ID error.

osp_get_lastfid_from_ost() should deactivate OSP only upon -EFAULT,
which means reading LAST_FID on OST failed. This can avoid unnecessary
admin intervention.

Add sanity 27S.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Ib78c8994c0398dd4b4db32005abd018933ef3a7c
Reviewed-on: https://review.whamcloud.com/45309
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>