ca+tools: configurable ca forwarding hint and ca-server interface improvement

Change-Id: I95cc6b2fb195f7c3625f14a4f8856abcf65022d9
diff --git a/tests/unit-tests/config-files/config-ca-1 b/tests/unit-tests/config-files/config-ca-1
index 8ea5d38..044260b 100644
--- a/tests/unit-tests/config-files/config-ca-1
+++ b/tests/unit-tests/config-files/config-ca-1
@@ -1,5 +1,6 @@
 {
   "ca-prefix": "/ndn",
+  "forwarding-hint": "/repo",
   "ca-info": "ndn testbed ca",
   "max-validity-period": "864000",
   "max-suffix-length": 3,