Fixing issue with gRPC endpoints and multi-stack

Change-Id: Ic63023d9a37c7861611e3c6247ba5bf4e82b2c69
diff --git a/voltha-stack/values.yaml b/voltha-stack/values.yaml
index 7f69868..ce0a87e 100644
--- a/voltha-stack/values.yaml
+++ b/voltha-stack/values.yaml
@@ -18,7 +18,7 @@
   log_level: "WARN"
   voltha_infra_name: "voltha-infra"
   voltha_infra_namespace: "infra"
-  core_endpoint: "{{ .Release.Name }}-{{ .Values.global.stack_name }}-core.{{ .Release.Namespace }}.svc:55558"
+  core_endpoint: "{{ .Release.Name }}-voltha-core.{{ .Release.Namespace }}.svc:55558"
   log_correlation:
     enabled: true
   tracing: