Silence drupal cron job

* modules/drupal/manifests/init.pp: Since the cron URL can return
content, write it to the bitbucket so that we don't annoy sysadmins
with cronspam every five minutes.

Change-Id: I9df9510eb14e89c380dadba98cd4834a6a83fffc
Merge "Silence drupal cron job"