tests: refactor common test infrastructure and fixtures

Change-Id: I597c11130eefa2cc2846ee6655c85dc04f2f22ef
diff --git a/tests/unit/security/pib/impl/key-impl.t.cpp b/tests/unit/security/pib/impl/key-impl.t.cpp
index b2dfd96..be986a1 100644
--- a/tests/unit/security/pib/impl/key-impl.t.cpp
+++ b/tests/unit/security/pib/impl/key-impl.t.cpp
@@ -24,7 +24,7 @@
 #include "ndn-cxx/security/pib/pib.hpp"
 
 #include "tests/boost-test.hpp"
-#include "tests/identity-management-fixture.hpp"
+#include "tests/key-chain-fixture.hpp"
 #include "tests/unit/security/pib/pib-data-fixture.hpp"
 
 namespace ndn {
@@ -131,7 +131,7 @@
 }
 
 class OverwriteFixture : public ndn::security::tests::PibDataFixture,
-                         public ndn::tests::IdentityManagementFixture
+                         public ndn::tests::KeyChainFixture
 {
 };