[CORD-3056] Listen for ONU events

Change-Id: I304b382718ed43d21708ac8a2eaaed51b87c6af9
diff --git a/xos/unittest.cfg b/xos/unittest.cfg
index 44c6ea4..123cb69 100644
--- a/xos/unittest.cfg
+++ b/xos/unittest.cfg
@@ -4,3 +4,4 @@
                  model_policies
                  steps
                  pull_steps
+                 event_steps