Fixed bad naming for parallel blocks in test salt model pipeline

Change-Id: I1036d01a654e379c56dcbb6387ae476b4b56f109
diff --git a/test-salt-models-pipeline.groovy b/test-salt-models-pipeline.groovy
index f4c65d4..7190eb6 100644
--- a/test-salt-models-pipeline.groovy
+++ b/test-salt-models-pipeline.groovy
@@ -135,7 +135,7 @@
             acc = 0
           }
 
-          branches[testTarget] = {
+          branches[clusterName] = {
             common.infoMsg("Running testing of salt model clusters - test group ${i}")
             build job: "test-salt-model-node", parameters: [
               [$class: 'StringParameterValue', name: 'DEFAULT_GIT_URL', value: defaultGitUrl],