NetworkPkg: Clean up source files

1. Do not use tab characters
2. No trailing white space in one line
3. All files must end with CRLF

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>

NetworkPkg/Ip6Dxe/Ip6Nd.c

@@ -1,7 +1,7 @@
 /** @file
   Implementation of Neighbor Discovery support routines.
 
-  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2018, 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
@@ -822,7 +822,7 @@ Ip6OnDADFinished (
   EFI_DHCP6_PACKET_OPTION   *Oro;
   EFI_DHCP6_RETRANSMISSION  InfoReqReXmit;
   EFI_IPv6_ADDRESS          AllNodes;
-  
+
   IpSb     = IpIf->Service;
   AddrInfo = DadEntry->AddressInfo;
 
@@ -988,7 +988,7 @@ Ip6InitDADProcess (
   if (Ip6FindDADEntry (IpIf->Service, &AddressInfo->Address, NULL) != NULL) {
     return EFI_SUCCESS;
   }
-  
+
   Status   = EFI_SUCCESS;
   IpSb     = IpIf->Service;
   DadXmits = &IpSb->Ip6ConfigInstance.DadXmits;