Markus Mäkelä ce5e429ad3 Move reauthentication to authenticators
Currently the only situation where a user needs to be authenticated after
the initial authentication is when a COM_CHANGE_USER is being
executed. This was previously handled by directly calling a function in
the MySQLAuth authenticator.

The new entry in the API of the authenticators is very specific to MySQL
and should be reviewed once other protocols are added.
2017-02-07 10:03:57 +02:00
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