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

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/voltha/templates/netconf.yaml b/voltha/templates/netconf.yaml
index 52989b8..7aa571b 100644
--- a/voltha/templates/netconf.yaml
+++ b/voltha/templates/netconf.yaml
@@ -46,8 +46,8 @@
       terminationGracePeriodSeconds: 10
       containers:
         - name: netconf
-          image: {{ .Values.netconfImage }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.netconf.repository }}:{{ tpl .Values.images.netconf.tag . }}
+          imagePullPolicy: {{ .Values.images.netconf.pullPolicy }}
           ports:
             - containerPort: 830
           env: