fixing number of ONOS instances in 2.8 scale jobs

Change-Id: I1ba4db45aad1dc516901cc5f1177479e422d762b
diff --git a/jjb/pipeline/voltha/voltha-2.8/voltha-scale-test.groovy b/jjb/pipeline/voltha/voltha-2.8/voltha-scale-test.groovy
index bc14f57..e314995 100644
--- a/jjb/pipeline/voltha/voltha-2.8/voltha-scale-test.groovy
+++ b/jjb/pipeline/voltha/voltha-2.8/voltha-scale-test.groovy
@@ -275,7 +275,6 @@
               atomixReplica: atomixReplicas,
               kafkaReplica: kafkaReplicas,
               etcdReplica: etcdReplicas,
-              onosReplica: onosReplicas,
             ])
 
             stackHelmFlags = " --set onu=${onus},pon=${pons} --set global.log_level=${logLevel.toLowerCase()} "
@@ -291,6 +290,7 @@
               extraHelmFlags: stackHelmFlags,
               localCharts: localCharts,
               adaptersToWait: 0, // no need to wait for adapters, 2.8 is kafka based
+              onosReplica: onosReplicas,
             ])
             sh """
               set +x