Allow parallel testing of salt-models

Change-Id: Icc9bfdb161f9c2e94db804c0bee19b43620f592d
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index a760944..8c04aba 100644
--- a/jenkins/client/job/salt-models/tests.yml
+++ b/jenkins/client/job/salt-models/tests.yml
@@ -41,7 +41,7 @@
                 default: "gerrit"
               PARALLEL_NODE_GROUP_SIZE:
                 type: string
-                default: "1"
+                default: "5"
               # Salt master setup extra formulas
               EXTRA_FORMULAS:
                 type: string