Don't setup access hosts for db users without the username_user format

Version 1.21.0

Feature
Finished

If a user is manually added to a mysql database, but doesn't follow the username_user format, da previously didn't care and would add/remove access hosts for that user because he's been granted access to the db. The change will check for the correct username format and not change the users' access hosts if the name doesn't fit the format.

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