CORD-3207 Make ONOS and Kafka service names configurable

Change-Id: I022dfce94a1d8b25662bbcc3610a4a4175804c85
diff --git a/xos-services/simpleexampleservice/templates/_helpers.tpl b/xos-services/simpleexampleservice/templates/_helpers.tpl
index d1fb889..3307f88 100644
--- a/xos-services/simpleexampleservice/templates/_helpers.tpl
+++ b/xos-services/simpleexampleservice/templates/_helpers.tpl
@@ -53,7 +53,7 @@
   password: {{ .Values.xosAdminPassword | quote }}
   endpoint: xos-core:50051
 event_bus:
-  endpoint: cord-kafka
+  endpoint: {{ .Values.kafkaService | quote }}
   kind: kafka
 required_models:
   - SimpleExampleService