Adding persistency to DT scale job on master

Change-Id: Ic43673e2a6ea7a63d1abf802ef9d389d7a89acdb
diff --git a/jjb/voltha-scale.yaml b/jjb/voltha-scale.yaml
index 6b81f35..6c2afca 100644
--- a/jjb/voltha-scale.yaml
+++ b/jjb/voltha-scale.yaml
@@ -96,7 +96,7 @@
           withEapol: false
           withDhcp: false
           withIgmp: false
-          extraHelmFlags: '-f /home/jenkins/voltha-scale/voltha-values.yaml '
+          extraHelmFlags: '-f /home/jenkins/voltha-scale/voltha-values.yaml --set etcd.persistence.enabled=true,etcd.persistence.storageClass=longhorn'
 
       - 'voltha-scale-measurements':
           name: 'voltha-scale-measurements-master-2-16-32-tt-subscribers'