Use travis as user instead root within DSN

tests/unit/data/config.php

@@ -3,7 +3,7 @@
 return array(
 	'mysql' => array(
 		'dsn' => 'mysql:host=127.0.0.1;dbname=yiitest',
-		'username' => 'root',
+		'username' => 'travis',
 		'password' => '',
 		'fixture' => __DIR__ . '/mysql.sql',
 	),