Admin password reset logic is wrong

Environment

Sonata packages

$ composer show sonata-project/*
sonata-project/admin-bundle              3.20.1 The missing Symfony Admin Generator
sonata-project/block-bundle              3.3.2  Symfony SonataBlockBundle
sonata-project/cache                     1.0.7  Cache library
sonata-project/cache-bundle              2.3.1  This bundle provides caching services
sonata-project/classification-bundle     3.3.1  Symfony SonataClassificationBundle
sonata-project/core-bundle               3.4.0  Symfony SonataCoreBundle
sonata-project/datagrid-bundle           2.2.1  Symfony SonataDatagridBundle
sonata-project/doctrine-extensions       1.0.2  Doctrine2 behavioral extensions
sonata-project/doctrine-orm-admin-bundle 3.1.6  Symfony Sonata / Integrate Doctrine ORM into the ...
sonata-project/easy-extends-bundle       2.2.0  Symfony SonataEasyExtendsBundle
sonata-project/exporter                  1.7.1  Lightweight Exporter library
sonata-project/formatter-bundle          3.2.2  Symfony SonataFormatterBundle
sonata-project/google-authenticator      1.0.2  Library to integrate Google Authenticator into a ...
sonata-project/intl-bundle               2.3.1  Symfony SonataIntlBundle
sonata-project/media-bundle              3.5.1  Symfony SonataMediaBundle
sonata-project/notification-bundle       3.1.0  Symfony SonataNotificationBundle
sonata-project/page-bundle               3.5.1  This bundle provides a Site and Page management t...
sonata-project/seo-bundle                2.2.0  Symfony SonataSeoBundle
sonata-project/user-bundle               3.2.4  Symfony SonataUserBundle

Symfony packages

$ composer show symfony/*
symfony/assetic-bundle     v2.8.2  Integrates Assetic into Symfony2
symfony/monolog-bundle     v3.1.0  Symfony MonologBundle
symfony/phpunit-bridge     v2.8.24 Symfony PHPUnit Bridge
symfony/polyfill-apcu      v1.4.0  Symfony polyfill backporting apcu_* functions to lower PHP ver...
symfony/polyfill-intl-icu  v1.4.0  Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-mbstring  v1.4.0  Symfony polyfill for the Mbstring extension
symfony/polyfill-php54     v1.4.0  Symfony polyfill backporting some PHP 5.4+ features to lower P...
symfony/polyfill-php55     v1.4.0  Symfony polyfill backporting some PHP 5.5+ features to lower P...
symfony/polyfill-php56     v1.4.0  Symfony polyfill backporting some PHP 5.6+ features to lower P...
symfony/polyfill-php70     v1.4.0  Symfony polyfill backporting some PHP 7.0+ features to lower P...
symfony/polyfill-util      v1.4.0  Symfony utilities for portability of PHP codes
symfony/security-acl       v2.8.0  Symfony Security Component - ACL (Access Control List)
symfony/swiftmailer-bundle v2.6.2  Symfony SwiftmailerBundle
symfony/symfony            v2.8.24 The Symfony PHP framework

PHP version

$ php -v
PHP 5.5.38 (cli) (built: Jul 20 2016 11:16:05)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2015 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies

Subject

The admin password reset logic is wrong. If you try to reset your password AND you didn't imported FOSUser fronted routes (I don't need register/login/reset login in the frontend), you get an error.

Even if you import routes, you receive a wrong reset url in the resetting email, containing an url to the password reset of front, not of the admin itself (sonata_user_admin_resetting_reset).

Steps to reproduce

Logout from the admin and try to login again
Click "Forgot password"
Enter a valid email address
Click "Password reset"

Expected results

A reset email is sent to the email address, containing a link generated using the route sonata_user_admin_resetting_reset.

Actual results

An exception is thrown:

None of the chained routers were able to generate route: Route 'fos_user_resetting_reset' not found

If you add FOSUser routes to your routing file, the generated password reset url points to the frontend, not to the admin itself.

sonata-project / SonataUserBundle