tests: Implement IdentityManagementV2Fixture for v2::KeyChain

The old IdentityManagementFixture is renamed to IdentityManagementV1Fixture.

This commit also removes global KeyChainFixture, as it doesn't work with
TestKeyChain test suites.  Instead, IdentityManagementFixtures are
customizing PIB/TPM modules.

Change-Id: Iadc43b78523cd43bff4f454d6aea2fca8107a650
Refs: #2926
diff --git a/tests/unit-tests/face.t.cpp b/tests/unit-tests/face.t.cpp
index 7d4c9c8..2813bd1 100644
--- a/tests/unit-tests/face.t.cpp
+++ b/tests/unit-tests/face.t.cpp
@@ -28,7 +28,7 @@
 
 #include "boost-test.hpp"
 #include "identity-management-time-fixture.hpp"
-#include "key-chain-fixture.hpp"
+#include "test-home-fixture.hpp"
 #include "make-interest-data.hpp"
 
 namespace ndn {