LU-11678 quota: make overquota flag for old req

LU-11678 quota: make overquota flag for old req

For the old request with over quota flag, the over quota flag
should still be marked at OSC, because the old request could be
processed afther the new request at OST, then it won't break the
quota enforement at OST.

Change-Id: Ic34c438fe3f018c3b596b26ad6dc945547c8fada
Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34645
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Shilong Wang <wshilong@ddn.com>
Reviewed-by: Gu Zheng <gzheng@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>