migrate ocflib.infra.db to ocflib.infra.mysql

[abizer]

as we now have a postgres service, we should rename ocflib.infra.db to ocflib.infra.mysql. it would be a good time to take care of things like #108 as well

[ghost]

A naive question that might be of poor formatting: after both using find . -type f -exec grep -H 'db' {} \; in my cloned ocflib repo and searching on github with criteria org:ocf ocflib.infra db, there are only three other files referencing that db.py file (namely ocflib/printing/quota.py, ocflib/lab/stats.py, and ocflib/vhost/mail.py). Does it solve this issue if I change the file name to mysql.py and change the references in the three files from db to mysql?

[abizer]

That should work, but you'll also need to migrate any direct calls to db.get_connection in any downstream projects like ocfweb, puppet, utils, etc, as well as in the tests, if there are any. I think there are a few.