Considering only critical tests in voltha-scale tests

Change-Id: I0d5bbc81845d4ee04bba6df7622805d7d5437f60
diff --git a/jjb/pipeline/voltha/master/voltha-scale-test.groovy b/jjb/pipeline/voltha/master/voltha-scale-test.groovy
index 13e7a89..0173ea8 100644
--- a/jjb/pipeline/voltha/master/voltha-scale-test.groovy
+++ b/jjb/pipeline/voltha/master/voltha-scale-test.groovy
@@ -606,6 +606,7 @@
         outputPath: 'RobotLogs',
         passThreshold: 100,
         reportFileName: '**/report*.html',
+        onlyCritical: true,
         unstableThreshold: 0]);
       // get all the logs from kubernetes PODs
       sh returnStdout: false, script: '''