Run check-tripleo jobs on stale changes

If check-tripleo results are more than 120 hours old rerun the jobs.

Change-Id: I0181c8fd8cd6f40419259e797e448d4017c34b53
Fixes-bug: #1304057

modules/openstack_project/files/zuul/layout.yaml

@@ -201,6 +201,10 @@ pipelines:
         - event: change-restored
         - event: comment-added
           comment_filter: (?i)^(Patch Set [0-9]+:\n\n)?\s*recheck(( (?:bug|lp)[\s#:]*(\d+))|( no bug))\s*$
+        - event: comment-added
+          require-approval:
+            - username: jenkins
+              older-than: 120h
     success:
       gerrit:
         force-message: true