Deprecate functions that use anonymous MySQL user

[dkess]

We currently have an anonymous MySQL user, which is used in three places:

• ocflib.lab.stats
• ocflib.misc.shorturls
• ocflib.printing.quota

Having a globally accessible MySQL user is very bad for security, so we should investigate ways to change how these modules work to not rely on a user.

If a function is only used internally, we should put it behind a MySQL account with a password. If it needs to be accessible globally (I don't think any of these do), we would need to make an ocfweb API for it.