Description:
------------
Involves three methods, Yaf_Dispatcher::setDefaultModule, Yaf_Dispatcher::setDefaultController, Yaf_Dispatcher::setDefaultAction

Test script:
---------------
/* Bootstrap.php */
<?php
class Bootstrap extends Yaf_Bootstrap_Abstract
{
    public function _initConfig(Yaf_Dispatcher $dispatcher)
    {
        $dispatcher->setDefaultModule("index")
            ->setDefaultController("admin")->setDefaultAction("login");
    }
}

/* index.php */
<?php
$config = array(
    "application" => array(
        "directory" => realpath(dirname(__FILE__)) . "/application/",
        "modules" => "Index,User,Admin",
    ),
);

$app = new Yaf_Application($config);
$app->bootstrap()->run();

/* /www/application/controllers/Admin.php */
<?php
class AdminController extends Yaf_Controller_Abstract
{
    public function loginAction()
    {
        echo "index::admin::login", PHP_EOL;
        return false;
    }
}

Expected result:
----------------
index::admin::login

Actual result:
--------------
index::admin::login
[Fri Apr 13 19:00:40 2018]  Script:  '/www/index.php'
/usr/local/php/php-7.2.4/Zend/zend_operators.c(2548) :  Freeing 0x000000010c604028 (6 bytes), script=/www/index.php
Last leak repeated 2 times
[Fri Apr 13 19:00:40 2018]  Script:  '/www/index.php'
/usr/local/php/include/php/Zend/zend_string.h(134) :  Freeing 0x000000010c66fb80 (32 bytes), script=/www/index.php
=== Total 4 memory leaks detected ===