Updated scale job pipeline to use correct voltctl version

Change-Id: Ifebc037aeb79d92a392b2da6fe11f5561c556d7e
diff --git a/jjb/pipeline/voltha/master/voltha-scale-multi-stack.groovy b/jjb/pipeline/voltha/master/voltha-scale-multi-stack.groovy
index 21331f8..56ddf59 100644
--- a/jjb/pipeline/voltha/master/voltha-scale-multi-stack.groovy
+++ b/jjb/pipeline/voltha/master/voltha-scale-multi-stack.groovy
@@ -148,6 +148,7 @@
     }
     stage('Deploy Voltha') {
       steps {
+        installVoltctl("${release}")
         deploy_voltha_stacks(params.volthaStacks)
       }
     }