[CORD-3026] Unify the usage of imagePullPolicy in helm-charts

Change-Id: I6135a81060eeb7f2831ce9c7207339f92017c10e
diff --git a/voltha/templates/ofagent.yaml b/voltha/templates/ofagent.yaml
index 124f0b4..9a2f836 100644
--- a/voltha/templates/ofagent.yaml
+++ b/voltha/templates/ofagent.yaml
@@ -41,8 +41,8 @@
             topologyKey: kubernetes.io/hostname
       containers:
       - name: ofagent
-        image: {{ .Values.pull_docker_registry }}{{ .Values.images.ofagent.repository }}:{{ .Values.images.ofagent.tag }}
-        imagePullPolicy: {{ .Values.image_pull_policy }}
+        image: {{ .Values.ofagentImage }}
+        imagePullPolicy: {{ .Values.imagePullPolicy }}
         env:
         - name: NAMESPACE
           valueFrom: