kafka integration helm changes

Change-Id: Ie85c9b11dcddc0191ecc3a04d220daa5760105af
diff --git a/voltha-stack/values.yaml b/voltha-stack/values.yaml
index cac4667..d4daa2e 100644
--- a/voltha-stack/values.yaml
+++ b/voltha-stack/values.yaml
@@ -76,3 +76,7 @@
 
 voltha-go-controller:
   enabled: false
+  services:
+     kafka:
+       cluster:
+         address: "{{ .Values.global.voltha_infra_name }}-kafka.{{ .Values.global.voltha_infra_namespace }}.svc:9092"