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/IScsiDxe/IScsiDns.h

@@ -2,7 +2,7 @@
  The header file of routines for IScsi driver to perform DNS
  resolution based on UEFI DNS protocols.
 
-Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2017 - 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
 which accompanies this distribution.  The full text of the license may be found at
@@ -56,4 +56,4 @@ IScsiDns6 (
   IN OUT ISCSI_SESSION_CONFIG_NVDATA     *NvData
   );
 
-#endif
+#endif