removing custom image for ATT 2-16-32 job

Change-Id: I86dcf0d86db6852eeaa0f36f1c9e93316bf92f9c
diff --git a/jjb/voltha-scale.yaml b/jjb/voltha-scale.yaml
index 02cf5e4..2d8d812 100644
--- a/jjb/voltha-scale.yaml
+++ b/jjb/voltha-scale.yaml
@@ -132,7 +132,6 @@
           withDhcp: true
           withIgmp: false
           extraHelmFlags: '--set authRetry=true,dhcpRetry=true'
-          onosImg: andreacampanella/voltha-onos:olt-queue
 
       - 'voltha-scale-measurements':
           name: 'voltha-scale-measurements-master-2-16-32-dt-subscribers'