Make sorry command disable mail service

[Storce]

Issue

The sorry command currently does not disable mail hosting for sorried users.

TODO

The sorry command should disable mail forwarding for sorried users. We currently store mail forwarding rules on maelstorm, our MySQL host, under the database ocfmail. The mail server authenticates with the MySQL database using pam-mysql and reads the entry.
As a result, there is no one-line solution to this issue. We cannot just delete the entry because

1. The entry will be repopulated through puppet anyways.
2. We want to make the process of unsorrying as simple as possible.