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/transport/test-homes/unix-transport/ok/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
index cb3fae3..ce8b950 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
@@ -1,2 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
 
 transport=unix:///tmp/test/nfd.sock