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

Change-Id: I5a94879966de2c166fed8dedda0ed1d65c33c300
diff --git a/tests/tools/nfdc/status-fixture.hpp b/tests/tools/nfdc/status-fixture.hpp
index 4517254..f5fc2ec 100644
--- a/tests/tools/nfdc/status-fixture.hpp
+++ b/tests/tools/nfdc/status-fixture.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2020,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -44,8 +44,8 @@
 
 using ndn::Face;
 using ndn::KeyChain;
-using ndn::security::v2::Validator;
-using ndn::security::v2::ValidatorNull;
+using ndn::security::Validator;
+using ndn::security::ValidatorNull;
 using boost::test_tools::output_test_stream;
 
 class MakeValidatorNull