Reduce the cron frequency for Rocky and Stein
Reduce the cron frequency for Rocky and Stein

The amount of commits received for these stable branches is now
smaller, and does not justify running DLRN every 5 minutes on each.

Change-Id: Ic570492781cc5018732ec94473d48b901bdc6ff2

javierpena/puppet-delorean,javierpena/puppet-delorean,javierpena/puppet-delorean,rdo-infra/puppet-dlrn,rdo-infra/puppet-dlrn,rdo-infra/puppet-dlrn