Added job_timer property to test salt models pipeline for customers

Change-Id: I45cae1205576398cb29aadf43c276d42c30011c5
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index 8744c0c..57e15b8 100644
--- a/jenkins/client/job/salt-models/tests.yml
+++ b/jenkins/client/job/salt-models/tests.yml
@@ -98,6 +98,9 @@
               credentials: "gerrit"
               script: test-customers-salt-models.groovy
             concurrent: false
+            trigger:
+               timer:
+                 spec: "{{job_timer}}"
             param:
               CUSTOMERS:
                 type: string