getUrl method return path prefixed by `app_dev.php`

On a simple web test case like this one:

```php
namespace Tests\AppBundle\Controller;

use Liip\FunctionalTestBundle\Test\WebTestCase;

final class DefaultControllerTest extends WebTestCase
{
public function testIndex(): void
{
$this->assertContains(
'This is an awesome website',
$this->fetchContent($this->getUrl('homepage'))
);
}

public function testTerms(): void
{
$this->assertContains(
'Terms of Service',
$this->fetchContent($this->getUrl('terms'))
);
}
}
```

`$this->getUrl()` return the path prefixed by `app_dev.php`, making the test failing:

```
sullivan@3c0fcd0ca9ed:/code$ phpunit tests/AppBundle/Controller/DefaultControllerTest.php

// Clearing the cache for the test environment with debug true

[OK] Cache for the "test" environment (debug=true) was successfully cleared.

PHPUnit 6.3.1 by Sebastian Bergmann and contributors.

FF 2 / 2 (100%)

Time: 3.75 seconds, Memory: 119.41MB

There were 2 failures:

1) Tests\AppBundle\Controller\DefaultControllerTest::testIndex
The Response was not successful: No route found for "GET /app_dev.php/" (404 Not Found)

Failed asserting that false is true.

/code/vendor/liip/functional-test-bundle/Utils/HttpAssertions.php:45
/code/vendor/liip/functional-test-bundle/Test/WebTestCase.php:858
/code/vendor/liip/functional-test-bundle/Test/WebTestCase.php:880
/code/tests/AppBundle/Controller/DefaultControllerTest.php:18

2) Tests\AppBundle\Controller\DefaultControllerTest::testTerms
The Response was not successful: No route found for "GET /app_dev.php/terms" (404 Not Found)

Failed asserting that false is true.

/code/vendor/liip/functional-test-bundle/Utils/HttpAssertions.php:45
/code/vendor/liip/functional-test-bundle/Test/WebTestCase.php:858
/code/vendor/liip/functional-test-bundle/Test/WebTestCase.php:880
/code/tests/AppBundle/Controller/DefaultControllerTest.php:26

FAILURES!
Tests: 2, Assertions: 2, Failures: 2.

Remaining vendor deprecation notices (11)
```

The path should be returned without `app_dev.php` AFAIK. Origin Symfony web test case does not use this prefix for client calls.

`config_test.yml` file:

```yaml
imports:
- { resource: config_dev.yml }

framework:
test: ~
session:
storage_id: session.storage.mock_file
profiler:
collect: false

web_profiler:
toolbar: false
intercept_redirects: false

swiftmailer:
disable_delivery: true

liip_functional_test: ~
```

`phpunit.xml.dist` configuration file (no override):

```xml

tests

src

```

Composer state:

```
sullivan@3c0fcd0ca9ed:/code$ composer show
amphp/amp v2.0.2 A non-blocking concurrency framework for PHP applications.
amphp/byte-stream v1.1.6 A stream abstraction to make working with non-blocking I/O simple.
amphp/parallel v0.1.8 Parallel processing component for Amp.
amphp/parser v1.0.0 A generator parser to make streaming parsers simple.
amphp/process v0.2.1 Asynchronous process manager
behat/transliterator v1.2.0 String transliterator
clue/stream-filter v1.4.0 A simple and modern approach to stream filtering in PHP
composer/ca-bundle 1.0.8 Lets you find a path to the system CA bundle, and includes a fallback to the Mozilla CA bundle.
cpliakas/git-wrapper 1.7.0 A PHP wrapper around the Git command line utility.
dama/doctrine-test-bundle v4.0.1 Symfony 2/3 bundle to isolate doctrine database tests and improve test performance
docker-php/docker-php 1.24.0 A Docker PHP client
doctrine/annotations v1.5.0 Docblock Annotations Parser
doctrine/cache v1.7.1 Caching library offering an object-oriented API for many cache backends
doctrine/collections v1.5.0 Collections Abstraction library
doctrine/common v2.8.1 Common Library for Doctrine projects
doctrine/dbal v2.6.2 Database Abstraction Layer
doctrine/doctrine-bundle 1.7.1 Symfony DoctrineBundle
doctrine/doctrine-cache-bundle 1.3.2 Symfony Bundle for Doctrine Cache
doctrine/doctrine-migrations-bundle v1.2.1 Symfony DoctrineMigrationsBundle
doctrine/inflector v1.2.0 Common String Manipulations with regard to casing and singular/plural rules.
doctrine/instantiator 1.1.0 A small, lightweight utility to instantiate objects in PHP without invoking their constructors
doctrine/lexer v1.0.1 Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.
doctrine/migrations v1.5.0 Database Schema migrations using Doctrine DBAL
doctrine/orm v2.5.11 Object-Relational-Mapper for PHP
egulias/email-validator 2.1.2 A library for validating emails against several RFCs
fig/link-util 1.0.0 Common utility implementations for HTTP links
fitbug/symfony-yaml-serializer-encoder-decoder v0.1.1 A encoder and decoder for Yaml for the Symfony Serializer Component.
friendsofsymfony/user-bundle v2.0.1 Symfony FOSUserBundle
greg0ire/enum v3.5.2 work around the missing enum type in php
guzzlehttp/guzzle 6.3.0 Guzzle is a PHP HTTP client library
guzzlehttp/promises v1.3.1 Guzzle promises library
guzzlehttp/psr7 1.4.2 PSR-7 message implementation that also provides common utility methods
hwi/oauth-bundle dev-master bbf26fe Support for authenticating users using both OAuth1.0a and OAuth2 in Symfony2.
incenteev/composer-parameter-handler v2.1.2 Composer script handling your ignored parameter file
jane/jane v1.5.1 Generate a serializable / deserializable object model given a json schema
jane/open-api v1.3.0 Generate a PHP Client API (PSR7 compatible) given a OpenApi (Swagger) specification
jane/openapi-runtime v1.0.0 Jane OpenAPI Runtime Library, dependencies and utility class for a library generated by jane/openapi
jane/runtime v1.0.0 Jane runtime Library
javiereguiluz/easyadmin-bundle v1.17.5 Admin generator for Symfony applications
jdorn/sql-formatter v1.2.17 a PHP SQL highlighting library
knplabs/doctrine-behaviors 1.5.0 Doctrine2 behavior traits
knplabs/github-api 2.6.0 GitHub API v3 client
knplabs/knp-markdown-bundle 1.5.1 Knplabs markdown bundle transforms markdown into html
liip/functional-test-bundle 1.8.0 This bundles provides additional functional test-cases for Symfony2 applications
m4tthumphrey/php-gitlab-api 9.5.0 GitLab API client
matthiasnoback/symfony-config-test v3.0.1 Library for testing user classes related to the Symfony Config Component
michelf/php-markdown 1.7.0 PHP Markdown
monolog/monolog 1.23.0 Sends your logs to files, sockets, inboxes, databases and various web services
nikic/php-parser v2.1.1 A PHP parser written in PHP
ocramius/package-versions 1.1.3 Composer plugin that provides efficient querying for installed package versions (no runtime IO)
ocramius/proxy-manager 2.1.1 A library providing utilities to generate, instantiate and generally operate with Object Proxies
pagerfanta/pagerfanta v1.0.5 Pagination for PHP 5.3
paragonie/random_compat v2.0.11 PHP 5.x polyfill for random_bytes() and random_int() from PHP 7
php-amqplib/php-amqplib v2.7.0 Formerly videlalvaro/php-amqplib. This library is a pure PHP implementation of the AMQP protocol. It's been tested against RabbitMQ.
php-amqplib/rabbitmq-bundle v1.13.0 Integrates php-amqplib with Symfony & RabbitMq. Formerly oldsound/rabbitmq-bundle.
php-http/cache-plugin v1.4.0 PSR-6 Cache plugin for HTTPlug
php-http/client-common v1.6.0 Common HTTP Client implementations and tools for HTTPlug
php-http/discovery 1.3.0 Finds installed HTTPlug implementations and PSR-7 message factories
php-http/guzzle6-adapter v1.1.1 Guzzle 6 HTTP Adapter
php-http/httplug v1.1.0 HTTPlug, the HTTP client abstraction for PHP
php-http/httplug-bundle v1.7.1 Symfony integration for HTTPlug
php-http/logger-plugin v1.0.0 PSR-3 Logger plugin for HTTPlug
php-http/message 1.6.0 HTTP Message related tools
php-http/message-factory v1.0.2 Factory interfaces for PSR-7 HTTP Message
php-http/mock-client v1.0.1 Mock HTTP client
php-http/multipart-stream-builder 1.0.0 A builder class that help you create a multipart stream
php-http/promise v1.0.0 Promise used for asynchronous HTTP requests
php-http/socket-client v1.3.0 Socket client for PHP-HTTP
php-http/stopwatch-plugin 1.0.1 Symfony Stopwatch plugin for HTTPlug
phpseclib/phpseclib 2.0.6 PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.
psr/cache 1.0.1 Common interface for caching libraries
psr/container 1.0.0 Common Container Interface (PHP FIG PSR-11)
psr/http-message 1.0.1 Common interface for HTTP messages
psr/link 1.0.0 Common interfaces for HTTP links
psr/log 1.0.2 Common interface for logging libraries
psr/simple-cache 1.0.0 Common interfaces for simple caching
sebastian/diff 2.0.1 Diff implementation
sensio/distribution-bundle v5.0.21 Base bundle for Symfony Distributions
sensio/framework-extra-bundle v5.0.1 This bundle provides a way to configure your controllers with annotations
sensio/generator-bundle v3.1.6 This bundle generates code for you
sensiolabs/security-checker v4.1.5 A security checker for your composer.lock
sllh/doctrine-dbal-utc-datetime v1.0.0 UTC DateTime type for Doctrine DBAL
sonata-project/intl-bundle 2.3.2 Symfony SonataIntlBundle
swiftmailer/swiftmailer v6.0.2 Swiftmailer, free feature-rich PHP mailer
symfony/monolog-bundle v3.1.1 Symfony MonologBundle
symfony/phpunit-bridge v3.3.10 Symfony PHPUnit Bridge
symfony/polyfill-apcu v1.6.0 Symfony polyfill backporting apcu_* functions to lower PHP versions
symfony/polyfill-intl-icu v1.6.0 Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-mbstring v1.6.0 Symfony polyfill for the Mbstring extension
symfony/polyfill-php56 v1.6.0 Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions
symfony/polyfill-php70 v1.6.0 Symfony polyfill backporting some PHP 7.0+ features to lower PHP versions
symfony/polyfill-util v1.6.0 Symfony utilities for portability of PHP codes
symfony/swiftmailer-bundle v3.1.5 Symfony SwiftmailerBundle
symfony/symfony v3.4.0-BETA1 The Symfony PHP framework
twig/extensions v1.5.1 Common additional features for Twig that do not directly belong in core
twig/twig v2.4.4 Twig, the flexible, fast, and secure template language for PHP
webmozart/assert 1.2.0 Assertions to validate method input/output with nice error messages.
zendframework/zend-code 3.3.0 provides facilities to generate arbitrary code using an object oriented interface
zendframework/zend-eventmanager 3.2.0 Trigger and listen to events within a PHP application
```

Tell me if you need more information.

Start at WebTestCase::getUrl, using the failing tests in tests/AppBundle/Controller/DefaultControllerTest.php and the reported PHPUnit command as the reproduction. Verify that generated paths no longer include app_dev.php and that both testIndex and testTerms requests succeed without 404 responses.

Written by the indexing model from the issue text.