Update validation related codes to security v2

Change-Id: I5467b87092820666c04f22623f0f1665ce9a1194
diff --git a/tools/ndns-delete-zone.cpp b/tools/ndns-delete-zone.cpp
index 141f498..254bf22 100644
--- a/tools/ndns-delete-zone.cpp
+++ b/tools/ndns-delete-zone.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014, Regents of the University of California.
+/*
+ * Copyright (c) 2014-2017, Regents of the University of California.
  *
  * This file is part of NDNS (Named Data Networking Domain Name Service).
  * See AUTHORS.md for complete list of NDNS authors and contributors.
@@ -78,7 +78,7 @@
   try {
     Name zone(zoneStr);
 
-    ndn::KeyChain keyChain;
+    KeyChain keyChain;
     ndn::ndns::ManagementTool tool(db, keyChain);
     tool.deleteZone(zone);
   }