Mysql user of admin with admin password for mysql access

[patch0]

Just had a customer who processed a migration from symb6 to symb8 and managed to overwrite the mysql db in the process.
Wondered if there might be some traction in having an admin user with the admin password as a mysql user that we can control access for a little more, no access to the mysql folder for example...

Originally reported on Bytemark's Gitlab by @dtargett on 2017-05-11T12:04:13.776Z

[patch0]

The use case would be to allow the "admin" user access to databases, but not to alter permissions. We could probably do this by not giving the "GRANT" privilege, but allowing general access. I'm not sure how useful this would be beyond the root user.