handle mysql master / slave connection

[jdeniau]

Actually, the $dbName is computed either from $params['dbname'] on $params['master']['dbname'] and override only the dbname parameter (not the master one) and there is no slave management except for sqlite.

This PR compute the dbname from the mysql connection and replace both dbname, master's dbname and all slaves dbname.

I test if the driver is pdo_mysql, but it might be the default case, what do you think ?

[DonCallisto]

I didn't had the chance to take a look at this. Would you mind to rebase this?
Moreoever I can't guarantee I'll have much free time to review this, but sooner or later I'll do.
Thanks.

[jdeniau]

@DonCallisto rebase done.

Take the time you need for the review, I'm using my patched version for the moment.

Thanks for maintaining this library !

[DonCallisto]

Doing my best with my little free time.
Thank you for contributing.