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

Change-Id: I6135a81060eeb7f2831ce9c7207339f92017c10e
diff --git a/voltha/templates/netconf.yaml b/voltha/templates/netconf.yaml
index cacbf2e..acec48f 100644
--- a/voltha/templates/netconf.yaml
+++ b/voltha/templates/netconf.yaml
@@ -53,8 +53,8 @@
               topologyKey: kubernetes.io/hostname
       containers:
       - name: netconf
-        image: {{ .Values.pull_docker_registry }}{{ .Values.images.netconf.repository }}:{{ .Values.images.netconf.tag }}
-        imagePullPolicy: {{ .Values.image_pull_policy }}
+        image: {{ .Values.netconfImage }}
+        imagePullPolicy: {{ .Values.imagePullPolicy }}
         ports:
         - containerPort: 830
         env: