Increase parallelism for salt-models testing

Change-Id: I7161dc4bb6724d8584b2ed0135861b7989daf91e
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index 50d1cc8..dd2ca90 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: "2"
+                default: "9"
               # Salt master setup extra formulas
               EXTRA_FORMULAS:
                 type: string