LU-2041 oi: keep oi mapping cache consistency

LU-2041 oi: keep oi mapping cache consistency

Sometimes the local ID of the per RPC thread OI mappig cache may be
changed, but the FID of such OI mapping cache has not been updated,
which will cause the RPC thread finds some unexpected object with
the given FID, should be fixed.

Move osd_device::osd_scrub::os_no_scrub to osd_device::od_noscrub.

Signed-off-by: Fan Yong <yong.fan@whamcloud.com>
Change-Id: Idbc46cd70b136b7ffc2528331d5593fbac725900
Reviewed-on: http://review.whamcloud.com/4207
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>