VOL-1967 voltha-2.1 tag on afrouter* is no more after move to new repo

Change-Id: Id8bcf897a5dd88ec7ecfb0e9e13750dcea1ad411
diff --git a/jjb/pipeline/voltha-bbsim-tests.groovy b/jjb/pipeline/voltha-bbsim-tests.groovy
index 8fa78d9..32c0ec9 100644
--- a/jjb/pipeline/voltha-bbsim-tests.groovy
+++ b/jjb/pipeline/voltha-bbsim-tests.groovy
@@ -117,6 +117,9 @@
 
            if [ "${gerritProject}" = "voltha-api-server" ]; then
              HELM_FLAG+="--set images.afrouter.tag=citest,images.afrouter.pullPolicy=Never,images.afrouterd.tag=citest,images.afrouterd.pullPolicy=Never"
+           else
+             # afrouter is disaggregated from the core, and lacks voltha-2.1 tags
+             HELM_FLAG+="--set images.afrouter.tag=master,images.afrouterd.tag=master "
            fi
 
            if [ "${gerritProject}" = "voltha-helm-charts" ]; then