Fixed error handling problem in mysql db library.

Till Brehm

2014-02-24 99101991199ac188d923aa64b0582deea0d86386

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[Definition]
failregex = (?: pop3-login|imap-login): .*(?:Authentication failure|Aborted login \(auth failed|Aborted login \(tried to use disabled|Disconnected \(auth failed).*rip=(?P<host>\S*),.*
ignoreregex =