common/modules/product/Module.php

<?php

namespace common\modules\product;

/**
 * product module definition class
 */
class Module extends \yii\base\Module
{
    /**
     * @inheritdoc
     */
    public $controllerNamespace = 'common\modules\product\controllers';

    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();

        \Yii::configure($this, require(__DIR__.'/config.php'));
    }
}