tests: IdentityManagementFixture no longer derives from BaseFixture

Also rename it to KeyChainFixture

Refs: #4528
Change-Id: Id86f4affc9c4c9ae159912430cc3e78557bf1ac2
diff --git a/tests/daemon/rib/fib-updates-common.hpp b/tests/daemon/rib/fib-updates-common.hpp
index 4668af5..7a123d3 100644
--- a/tests/daemon/rib/fib-updates-common.hpp
+++ b/tests/daemon/rib/fib-updates-common.hpp
@@ -28,7 +28,7 @@
 
 #include "rib/fib-updater.hpp"
 
-#include "tests/identity-management-fixture.hpp"
+#include "tests/key-chain-fixture.hpp"
 #include "tests/daemon/rib/create-route.hpp"
 
 #include <ndn-cxx/util/dummy-client-face.hpp>
@@ -60,7 +60,7 @@
   return false;
 }
 
-class FibUpdatesFixture : public nfd::tests::IdentityManagementFixture
+class FibUpdatesFixture : public nfd::tests::BaseFixture, public nfd::tests::KeyChainFixture
 {
 public:
   FibUpdatesFixture()