CORD-3207 Make ONOS and Kafka service names configurable

Change-Id: I022dfce94a1d8b25662bbcc3610a4a4175804c85
diff --git a/xos-services/volt/values.yaml b/xos-services/volt/values.yaml
index 26b5f7e..2f1edb4 100644
--- a/xos-services/volt/values.yaml
+++ b/xos-services/volt/values.yaml
@@ -29,6 +29,8 @@
 xosAdminUser: "admin@opencord.org"
 xosAdminPassword: "letmein"
 
+kafkaService: "cord-kafka"
+
 resources: {}
 
 nodeSelector: {}