Revert "Removed code that was used as test fix for a letsencrypt issue."

Marius Burkard

2016-05-27 2a629844e8d67d6bc31d54e34ad1cda833c2e360

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ALTER TABLE `web_domain` ADD `last_quota_notification` DATE NULL DEFAULT NULL;
ALTER TABLE `mail_user` ADD `last_quota_notification` DATE NULL DEFAULT NULL;