interest-loop-scenario: Add test cast for Interest loop scenario.

Change-Id: Ic83735a24488614236eb6fbb7c7c79260434e457
Refs: #1409
diff --git a/.gitignore b/.gitignore
index 5cf7948..d1ba9e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.pyc
 */logs
+test_interest_loop/keys