NetworkPkg: Support print help information using -? command.

v2:
*Modify the logic of show SAD,SPD and PAD help info, include them in -?
instead of follow -p command.

Since Shell supports finding help information from resource section
of application image. We modify the Shell application Under NetworkPkg
to support print help information string using -? command.

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: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>

NetworkPkg/Application/Ping6/Ping6.inf

@@ -3,7 +3,7 @@
 #
 #  It is an shell application which is used to Ping the target host with IPv6 stack.
 #
-#  Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 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
@@ -24,6 +24,12 @@
   ENTRY_POINT                    = InitializePing6
   MODULE_UNI_FILE                = Ping6.uni
 
+#
+#
+#  This flag specifies whether HII resource section is generated into PE image.
+#
+  UEFI_HII_RESOURCE_SECTION      = TRUE
+
 #
 # The following information is for reference only and not required by the build tools.
 #
@@ -53,6 +59,7 @@
   BaseLib
   UefiBootServicesTableLib
   UefiApplicationEntryPoint
+  UefiHiiServicesLib
   BaseMemoryLib
   ShellLib
   MemoryAllocationLib
@@ -65,6 +72,7 @@
   gEfiIp6ProtocolGuid                           ## CONSUMES
   gEfiIp6ServiceBindingProtocolGuid             ## CONSUMES
   gEfiIp6ConfigProtocolGuid                     ## CONSUMES
+  gEfiHiiPackageListProtocolGuid                ## CONSUMES
 
 [UserExtensions.TianoCore."ExtraFiles"]
   Ping6Extra.uni