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

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/voltha/templates/ofagent.yaml b/voltha/templates/ofagent.yaml
index 83d3848..c70f408 100644
--- a/voltha/templates/ofagent.yaml
+++ b/voltha/templates/ofagent.yaml
@@ -32,8 +32,8 @@
       terminationGracePeriodSeconds: 10
       containers:
         - name: ofagent
-          image: {{ .Values.ofagentImage }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.ofagent.repository }}:{{ tpl .Values.images.ofagent.tag . }}
+          imagePullPolicy: {{ .Values.images.ofagent.pullPolicy }}
           env:
             - name: NAMESPACE
               valueFrom: