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

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/voltha/templates/vcore_for_etcd.yaml b/voltha/templates/vcore_for_etcd.yaml
index 4643d88..5ea1d42 100644
--- a/voltha/templates/vcore_for_etcd.yaml
+++ b/voltha/templates/vcore_for_etcd.yaml
@@ -61,8 +61,8 @@
       serviceAccountName: {{ .Values.global.namespace }}-serviceaccount
       containers:
         - name: voltha
-          image: {{ .Values.vcoreImage }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.vcore.repository }}:{{ tpl .Values.images.vcore.tag . }}
+          imagePullPolicy: {{ .Values.images.vcore.pullPolicy }}
           env:
             - name: NAMESPACE
               valueFrom: