security: Pair-up Tpm and Pib in KeyChain

In this commit, we also change the HOME setting for test cases.

Change-Id: I7fa15461555b3519d9d2005c6956c167ed07d66f
Refs: #2242
Refs: #2260
diff --git a/tests/unit-tests/util/test-io.cpp b/tests/unit-tests/util/test-io.cpp
index b170f6e..b857a4a 100644
--- a/tests/unit-tests/util/test-io.cpp
+++ b/tests/unit-tests/util/test-io.cpp
@@ -21,7 +21,7 @@
 
 #include "util/io.hpp"
 #include "security/key-chain.hpp"
-#include "../security/identity-management-fixture.hpp"
+#include "identity-management-fixture.hpp"
 
 #include "boost-test.hpp"