Fix ONOS voltha version for CORD 6.0

Change-Id: I4be9e68095020bebeae725e2f6c63ae8d0700234
diff --git a/configs/onos-voltha.yaml b/configs/onos-voltha.yaml
index 3f7b95c..5792ad3 100644
--- a/configs/onos-voltha.yaml
+++ b/configs/onos-voltha.yaml
@@ -24,7 +24,7 @@
 namespace: voltha
 serviceAccountName: voltha-serviceaccount
 
-onosImage: 'voltha/voltha-onos:latest'
+onosImage: 'voltha/voltha-onos:1.4.0'
 
 services:
   openflowServiceType: ClusterIP