Cleanup params in jenkins jobs

Change-Id: I5400aadc63a11d54310975a1d4d722c9b90dc70b
diff --git a/jenkins/client/job/image/ubuntu.yml b/jenkins/client/job/image/ubuntu.yml
index e49bda0..504702c 100755
--- a/jenkins/client/job/image/ubuntu.yml
+++ b/jenkins/client/job/image/ubuntu.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    jenkins_packer_pipeline: "${_param:jenkins_gerrit_url}/mk/packer-templates"
   jenkins:
     client:
       job: