Upgrade Mysql from 5.0.92 to 5.5.30: Error code has changed

## Context
Upgrade Mysql from 5.0.92 to 5.5.30.

## Description
When connecting to an unknown catalog: 
* before the error code was 1044 (access denied)
* now it the error code is 1049 (unknown database).

The unit test has been updated.