fixing make build command for bbsim test

Change-Id: Ib06986d0efcd4f6fd747bfb391676a5ab7eb9a9d
diff --git a/jjb/pipeline/voltha-atest-provisioning.groovy b/jjb/pipeline/voltha-atest-provisioning.groovy
index bebb0de..de7ef0b 100755
--- a/jjb/pipeline/voltha-atest-provisioning.groovy
+++ b/jjb/pipeline/voltha-atest-provisioning.groovy
@@ -59,7 +59,7 @@
         sudo service docker restart
         cd $WORKSPACE/cord/incubator/voltha-bbsim
         repo download "${GERRIT_PROJECT}" "${gerritChangeNumber}/${gerritPatchsetNumber}"
-        make docker-build
+	make DOCKER_TAG=latest docker-build
         docker images | grep bbsim
         '''
       }