Better error reporting on provisioning db

In provsioning_db_connect(), it would be better to report the actual error from mysql, not just that an error occured:


if (!$connection) {
drush_set_error('PROVISION_MASTER_DB_FAILED', dt('Could not connect to the master \
database server.') ." ". mysql_error(), 'error');
}
else {
$success = @mysql_select_db('mysql', $connection);
if ($success) {
_provision_db_connection($connection);
}
else {
drush_set_error('PROVISION_MASTER_DB_FAILED', dt('Could not select the mysql dat\
abase.') .' '. mysql_error(), 'error');
return FALSE;
}
}