CryptoPkg: Add Null instance of the TlsLib class

https://bugzilla.tianocore.org/show_bug.cgi?id=2258

Add a Null instance of the TlsLib class.  This lib instance
can be used as a template for new implementations of the TlsLib
class and can also be used to reduce CI build times for build
checks that depend on the TlsLib class.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>

CryptoPkg/Library/TlsLibNull/InternalTlsLib.h

@@ -0,0 +1,16 @@
+/** @file
+  Internal include file for TlsLibNull.
+
+Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __INTERNAL_TLS_LIB_NULL_H__
+#define __INTERNAL_TLS_LIB_NULL_H__
+
+#include <Library/BaseCryptLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseLib.h>
+
+#endif