Fuel db persistent connection (#3722)

frameworks/PHP/fuel/fuel/app/config/production/db.php

@@ -9,6 +9,7 @@ return array(
 			'dsn'        => 'mysql:host=tfb-database;dbname=hello_world',
 			'username'   => 'benchmarkdbuser',
 			'password'   => 'benchmarkdbpass',
+			'persistent' => true,
 		),
 	),
 );