Allow to set refspec for salt-generated jobs

Change-Id: I07f61ee7ca981ae3bd588de995aa48c93123892b
Related-task: #PROD-23187 (PROD:23187)
diff --git a/tests/pillar/client.sls b/tests/pillar/client.sls
index d1078a5..37b4a7a 100644
--- a/tests/pillar/client.sls
+++ b/tests/pillar/client.sls
@@ -29,6 +29,9 @@
           url: https://github.com/jenkinsci/docker.git
           branch: master
           script: Jenkinsfile
+          remote_name: origin
+          refspec: "$ref"
+          wipe_workspace: true
           github:
             url: https://github.com/jenkinsci/docker
             name: "Jenkins Docker Image"
@@ -48,6 +51,10 @@
             type: boolean
             description: true/false
             default: true
+          ref:
+            type: string
+            description: ref
+            default: ""
           string_param:
             type: string
             description: 1 liner