security: Convert ValidatorConfig to ValidationPolicyConfig

The security API also provides a convenience ValidatorConfig helper.

Change-Id: Ic86dec4904b917361cb4740204de4b6710d2a386
Refs: #3920
diff --git a/tests/identity-management-fixture.hpp b/tests/identity-management-fixture.hpp
index a6b348f..82545f9 100644
--- a/tests/identity-management-fixture.hpp
+++ b/tests/identity-management-fixture.hpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
@@ -25,11 +25,12 @@
 #include "security/v1/key-chain.hpp"
 #include "security/v2/key-chain.hpp"
 #include "security/signing-helpers.hpp"
-#include <vector>
 
 #include "boost-test.hpp"
 #include "test-home-fixture.hpp"
 
+#include <vector>
+
 namespace ndn {
 namespace tests {
 
@@ -117,7 +118,7 @@
    *  @return whether successful
    */
   bool
-  saveIdentityCertificate(const security::Identity& identity, const std::string& filename);
+  saveCertificate(const security::Identity& identity, const std::string& filename);
 
   /**
    * @brief Issue a certificate for \p subIdentityName signed by \p issuer