pipeline syntax in bbsim-atest job

Change-Id: I1810fc3851eb57a51c78a3eb7a8eebd01680d409
diff --git a/jjb/pipeline/voltha-atest-provisioning.groovy b/jjb/pipeline/voltha-atest-provisioning.groovy
index 5a17015..a67eafe 100755
--- a/jjb/pipeline/voltha-atest-provisioning.groovy
+++ b/jjb/pipeline/voltha-atest-provisioning.groovy
@@ -58,7 +58,7 @@
         sh '''
         sudo service docker restart
         cd $WORKSPACE/cord/incubator/voltha-bbsim
-        repo download ${gerritProject} "${gerritChangeNumber}/${gerritPatchsetNumber}"
+        repo download "${GERRIT_PROJECT}" "${gerritChangeNumber}/${gerritPatchsetNumber}"
         make docker
         docker images | grep bbsim
         '''