Logrotate track upstream logs

There is currently a single 3.6GB track_upstream.log logfile on
review.o.o. It has data from March 2017 through to today (October 2017).
Lets rotate this logfile and keep 30 days worth of logs to reduce its
impact on the local filesystem.

Change-Id: Id80ab28b3c7dc9881ac28f55fa07aa539a11787d

modules/openstack_project/manifests/gerrit.pp

@@ -489,6 +489,19 @@ class openstack_project::gerrit (
         ],
         require => Exec['manage_projects'],
       }
+
+      logrotate::file { 'track_upstream.log':
+        log     => '/var/log/track_upstream.log',
+        options => [
+          'compress',
+          'missingok',
+          'rotate 30',
+          'daily',
+          'notifempty',
+          'copytruncate',
+        ],
+        require => Cron['track_upstream'],
+      }
     }
   }
   file { '/home/gerrit2/review_site/bin/set_agreements.sh':