ndns-dig: adapt to the fact that NDN testbed does not have root zone

- Enable dig to set the start label during iterative process.
- Enable validation of intermediate results with an option to disable
it

Change-Id: I221e3c328c875ad06a1f8094f1004e68d9d46a57
diff --git a/tests/unit/clients/iterative-query-controller.cpp b/tests/unit/clients/iterative-query-controller.cpp
index 0346419..7713a5b 100644
--- a/tests/unit/clients/iterative-query-controller.cpp
+++ b/tests/unit/clients/iterative-query-controller.cpp
@@ -98,7 +98,7 @@
   // IterativeQueryController is a whole process
   // the tester should not send Interest one by one
   // instead of starting it and letting it handle Interest/Data automatically
-  ctr->setNFinishedComps(1);
+  ctr->setStartComponentIndex(1);
 
   ctr->start();