Add default git params to test system reclass job

Change-Id: I5758765d282fb6c63558d6c2dd8c0e4deada0bd4
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index 72feaa1..c980d1d 100644
--- a/jenkins/client/job/salt-models/tests.yml
+++ b/jenkins/client/job/salt-models/tests.yml
@@ -82,3 +82,10 @@
               TEST_MODELS:
                 type: string
                 default: "{{clusters}}"
+              DEFAULT_GIT_URL:
+                type: string
+                description: "Run against alternate system reclass"
+                default: "${_param:jenkins_gerrit_url}/salt-models/reclass-system"
+              DEFAULT_GIT_REF:
+                type: string
+                default: master