For non-XOS charts, use a global registry var, split docker image name/tag/pullPolicy

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/voltha/templates/envoy_for_etcd.yaml b/voltha/templates/envoy_for_etcd.yaml
index 4869682..92092bc 100644
--- a/voltha/templates/envoy_for_etcd.yaml
+++ b/voltha/templates/envoy_for_etcd.yaml
@@ -1,3 +1,4 @@
+---
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -41,8 +42,8 @@
       serviceAccountName: {{ .Values.global.namespace }}-serviceaccount
       containers:
         - name: voltha
-          image: {{ .Values.envoyForEtcdImage }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.envoy_for_etcd.repository }}:{{ tpl .Values.images.envoy_for_etcd.tag . }}
+          imagePullPolicy: {{ .Values.images.envoy_for_etcd.pullPolicy }}
           env:
             - name: POD_IP
               valueFrom: