NetworkPkg: Addressing TCP Window Retraction when window scale factor is used.

The RFC1323 which defines the TCP window scale option has been obsoleted by RFC7323.
This patch is to follow the RFC7323 to address the TCP window retraction problem
when a non-zero scale factor is used.
The changes has been test in high packet loss rate network by using HTTP boot and
iSCSI file read/write.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
(cherry picked from commit 3696ceaecb)

NetworkPkg/TcpDxe/TcpMisc.c

@@ -2,7 +2,7 @@
   Misc support routines for TCP driver.
 
   (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
-  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -86,6 +86,7 @@ TcpInitTcbLocal (
   // First window size is never scaled
   //
   Tcb->RcvWndScale  = 0;
+  Tcb->RetxmitSeqMax = 0;
 
   Tcb->ProbeTimerOn = FALSE;
 }