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

Change-Id: I6135a81060eeb7f2831ce9c7207339f92017c10e
diff --git a/configs/onos-cord.yaml b/configs/onos-cord.yaml
index 764f143..e4d4fb9 100644
--- a/configs/onos-cord.yaml
+++ b/configs/onos-cord.yaml
@@ -16,8 +16,7 @@
 
 # Parameters for running ONOS with VTN
 #
-# helm install -f configs/onos-cord.yaml onos
+# helm install onos -f configs/onos-cord.yaml -n onos-cord
 
 # VTN is not working with 1.13 at present
-image:
-  tag: 1.12.0
+onosImage: 'onosproject/onos:1.12.0'
diff --git a/configs/onos-fabric.yaml b/configs/onos-fabric.yaml
index 8115b1d..ac25a5d 100644
--- a/configs/onos-fabric.yaml
+++ b/configs/onos-fabric.yaml
@@ -16,7 +16,7 @@
 
 # Expose ONOS services using NodePorts, for onos-fabric configuration
 #
-# helm install -f configs/onos-fabric.yaml onos
+# helm install onos -f configs/onos-fabric.yaml -n onos-fabric
 
 services:
   openflowServiceType: NodePort
diff --git a/configs/onos-voltha.yaml b/configs/onos-voltha.yaml
index 2bce674..3f7b95c 100644
--- a/configs/onos-voltha.yaml
+++ b/configs/onos-voltha.yaml
@@ -16,17 +16,15 @@
 
 # Expose ONOS services using NodePorts, for onos-voltha configuration
 #
-# helm install -f configs/onos-voltha.yaml onos
+# helm install onos -f configs/onos-voltha.yaml -n onos-voltha
+
 nameOverride: "onosv"
 fullnameOverride: "onos-voltha"
 
 namespace: voltha
 serviceAccountName: voltha-serviceaccount
 
-image:
-  repository: voltha/voltha-onos
-  tag: 'latest'
-  pullPolicy: IfNotPresent
+onosImage: 'voltha/voltha-onos:latest'
 
 services:
   openflowServiceType: ClusterIP