test_interest_loop: no longer passes when commands fail

refs #2386

Change-Id: I71deb55f3655ef7dba11e6532e91ee34309fa32d
diff --git a/test_interest_loop/test_interest_loop.py b/test_interest_loop/test_interest_loop.py
index e08b733..b4b1bf7 100644
--- a/test_interest_loop/test_interest_loop.py
+++ b/test_interest_loop/test_interest_loop.py
@@ -16,6 +16,8 @@
     errormsg = {
         1 : "Counter for incoming interest is greater than 200.",
         2 : "Counter for outgoing interest is greater than 200.",
+        3 : "add-nexthop failed",
+        4 : "nfd-status failed",
     }
 
     def setUp(self):