Remove freshness check from tripleo

It doesn't work as expected because it depends on the timing of
the vote from the check queue.  It's unlikely to ever trigger
on its own unless the check queue is 48 hours backlogged (120-72).
Except now it _is_ triggering in a loop because we stopped doing
freshness checks for -1 votes, so we can have an old jenkins vote
that never gets updated.

Change-Id: Ib89ed3c8f76ecded9f04bbcd784c3e91a835cc54

modules/openstack_project/files/zuul/layout.yaml

@@ -209,10 +209,6 @@ pipelines:
         - event: change-restored
         - event: comment-added
           comment_filter: (?i)^(Patch Set [0-9]+:)?( [\w\\+-]*)*(\n\n)?\s*recheck(( (?:bug|lp)[\s#:]*(\d+))|( no bug))\s*$
-        - event: comment-added
-          require-approval:
-            - username: jenkins
-              older-than: 120h
     success:
       gerrit: {}
     failure: