tests: IdentityManagementFixture no longer derives from BaseFixture

Also rename it to KeyChainFixture

Refs: #4528
Change-Id: Id86f4affc9c4c9ae159912430cc3e78557bf1ac2
diff --git a/tests/tools/ndn-autoconfig-server/program.t.cpp b/tests/tools/ndn-autoconfig-server/program.t.cpp
index 1b928b0..b8209b0 100644
--- a/tests/tools/ndn-autoconfig-server/program.t.cpp
+++ b/tests/tools/ndn-autoconfig-server/program.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2019,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -25,7 +25,7 @@
 
 #include "ndn-autoconfig-server/program.hpp"
 
-#include "tests/identity-management-fixture.hpp"
+#include "tests/key-chain-fixture.hpp"
 
 #include <ndn-cxx/encoding/buffer.hpp>
 #include <ndn-cxx/util/dummy-client-face.hpp>
@@ -35,9 +35,7 @@
 namespace autoconfig_server {
 namespace tests {
 
-using namespace ::nfd::tests;
-
-class AutoconfigServerFixture : public IdentityManagementFixture
+class AutoconfigServerFixture : public ::nfd::tests::KeyChainFixture
 {
 public:
   AutoconfigServerFixture()