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.

Signed-off-by: Fan Yong <yong.fan@whamcloud.com>
Change-Id: I90cc01601925ada08e0f021ba49e3310f10aed35
Reviewed-on: http://review.whamcloud.com/4208
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>