LU-8645 ptlrpc: update imp_known_replied_xid on resend-replay

LU-8645 ptlrpc: update imp_known_replied_xid on resend-replay

The imp_known_replied_xid should be updated when try to resend
an already replied replay request, because the xid of this replay
request could be less than current imp_known_replied_xid.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: Iaafcb187efb24cc88dc96b30a63083fac83a9078
Reviewed-on: http://review.whamcloud.com/22776
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Jenkins
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>