NetworkPkg:Add a new error status code EFI_HTTP_ERROR

v4:
* Update macro HTTP_ERROR_STATUS to HTTP_ERROR_OR_NOT_SUPPORT_STATUS_CODE
Update copyright year.
When the Error Status of ResponseData returned from HttpIoRecvResponse
function during the Http HEAD method, it should also return error status
to Load file protocol.

Add a new error status code EFI_HTTP_ERROR in corresponding with the
UEFI 2.6 spec . When a HTTP error occurred during the network operation,
The EFI_HTTP_ERROR is returned in token.

Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>

NetworkPkg/HttpDxe/HttpProto.h

@@ -1,7 +1,7 @@
 /** @file
   The header files of miscellaneous routines for HttpDxe driver.
 
-Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2015 - 2016, 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
 which accompanies this distribution.  The full text of the license may be found at
@@ -90,6 +90,8 @@ typedef struct _HTTP_PROTOCOL {
   BOOLEAN                       InDestroy;
   INTN                          State;
 
+  UINTN                         StatusCode;
+
   EFI_HANDLE                    Tcp4ChildHandle;
   EFI_TCP4_PROTOCOL             *Tcp4;
   EFI_TCP4_CONFIG_DATA          Tcp4CfgData;