Revert "Using dev image for BBSim in scale test"

This reverts commit f273626552485458545de7a0e4710aa39555034c.

Reason for revert: Suspect that it's breaking the authentication in the scale test

Change-Id: I720b69b1a4db3927013f466ce1e1990d462950ac
diff --git a/jjb/voltha-scale.yaml b/jjb/voltha-scale.yaml
index cf88246..c1904ea 100644
--- a/jjb/voltha-scale.yaml
+++ b/jjb/voltha-scale.yaml
@@ -71,7 +71,7 @@
           openoltAdapterImg:  gcgirish/voltha-openolt-adapter:flowChanPerSub
           rwCoreImg: matteoscandolo/voltha-rw-core:sync-delete
           radiusChart: /home/cord/helm-charts/freeradius
-          bbsimImg: matteoscandolo/bbsim:nni-packet-logs
+
 
       # jobs for 512 ONUs with a 8 openonu-adapters and clustered ONOS (1 OLT)
       - 'voltha-scale-measurements':