Adjust includes for the updated locations of ndn-cxx security headers

Change-Id: I788d56cee45aae9f7ce5d15320395d3d591f7e61
diff --git a/tests/identity-management-fixture.hpp b/tests/identity-management-fixture.hpp
index c83bf30..2f25cbe 100644
--- a/tests/identity-management-fixture.hpp
+++ b/tests/identity-management-fixture.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2019 Regents of the University of California.
+ * Copyright (c) 2013-2020 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -25,7 +25,7 @@
 #include "test-home-fixture.hpp"
 #include "unit-test-time-fixture.hpp"
 #include "boost-test.hpp"
-#include <ndn-cxx/security/v2/key-chain.hpp>
+#include <ndn-cxx/security/key-chain.hpp>
 #include <ndn-cxx/security/signing-helpers.hpp>
 #include <vector>