[VOL-3780] Always use master images in physical PODs test

Change-Id: I02cfa42523d6a1a0977599181b63dc1ed51eebc0
diff --git a/kubernetes-configs/voltha/onf-demo-pod.yml b/kubernetes-configs/voltha/onf-demo-pod.yml
index 825f358..f9500f7 100644
--- a/kubernetes-configs/voltha/onf-demo-pod.yml
+++ b/kubernetes-configs/voltha/onf-demo-pod.yml
@@ -12,9 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-defaults:
+global:
   image_tag: master
   image_pullPolicy: Always
+onos-classic:
+  image:
+    tag: master
 
 onosSshPort: 30115
 onosApiPort: 30120