LU-4927 scrub: rebuild stale OST OI mapping

LU-4927 scrub: rebuild stale OST OI mapping

If the osd_oi_lookup() which is called by osd_scrub_check_update()
returns -ESTALE for an OST FID, then it means that the target FID
has invalid OI mapping, and should be rebuilt.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I4087da9d3c8e18aff14e314af49637134ee8d4ff
Reviewed-on: http://review.whamcloud.com/10006
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>