Always pass extraHelmFlag as last parameter in helm install commands

Change-Id: I2b251f954fd703095595a9dbcec25e5020a23a87
diff --git a/vars/volthaInfraDeploy.groovy b/vars/volthaInfraDeploy.groovy
index e7af5e2..4f828fd 100644
--- a/vars/volthaInfraDeploy.groovy
+++ b/vars/volthaInfraDeploy.groovy
@@ -48,8 +48,8 @@
     """
     // TODO support multiple replicas
     sh """
-    helm upgrade --install --create-namespace -n ${cfg.infraNamespace} voltha-infra ${volthaInfraChart} ${cfg.extraHelmFlags} \
+    helm upgrade --install --create-namespace -n ${cfg.infraNamespace} voltha-infra ${volthaInfraChart} \
           --set onos-classic.replicas=${cfg.onosReplica},onos-classic.atomix.replicas=${cfg.atomixReplica} \
-          -f $WORKSPACE/voltha-helm-charts/examples/${cfg.workflow}-values.yaml
+          -f $WORKSPACE/voltha-helm-charts/examples/${cfg.workflow}-values.yaml ${cfg.extraHelmFlags}
     """
 }