getGeneratedKey implementation correction for multiple result for one query

When executing a single query, getGeneratedKey currently might return a resultset with multiple keys.

example :
INSERT INTO testMultiGeneratedKey (text) VALUES ('someValue'), ('someOtherValue');

But MariaDB protocol returns only one OK_Packet indicating first automatically generated Id and number of affected rows.

This can cause alternate issues like INSERT ...ON DUPLICATE KEY that return 2 affected rows in case of existing ID. (And so returning 2 rows in getGeneratedKey)

Driver must not trying to be better than what server returns.