Bug 1499590 - Add periodic-file-updates task to .cron.yml. r=darktrojan,dustin Added configuration for periodic-file-updates task to comm's .cron.yml. This cron task mirrors one found in mozilla- repositories, and was part of comm-'s buildbot configuration that needed to be moved to Taskcluster. This is a reapply of an old patch. I've removed the comm-beta and comm-esr60 repositories from the configuration. Differential Revision: https://phabricator.services.mozilla.com/D15108

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