Adding retry mechanism for ONU are not yet discovered by XOS

Change-Id: Ibd7bb08f48a89b9ac3951cb86ec02f8b216078c8
diff --git a/samples/onu_activate_event.py b/samples/onu_activate_event.py
index 56f4c76..8786ed5 100644
--- a/samples/onu_activate_event.py
+++ b/samples/onu_activate_event.py
@@ -24,6 +24,6 @@
     'uni_port_id': 16,
     'of_dpid': 'of:109299321'
 })
-producer = KafkaProducer(bootstrap_servers="cord-kafka-kafka")
+producer = KafkaProducer(bootstrap_servers="cord-kafka")
 producer.send("onu.events", event)
 producer.flush()
\ No newline at end of file