bug symfony#17048 Fix the logout path when not using the router (stof)

This PR was merged into the 2.3 branch.

Discussion
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Fix the logout path when not using the router

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#17029
| License       | MIT
| Doc PR        | n/a

This needs to use the base url, not the base path, so that it goes through the front controller when not using url rewriting.

Commits
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1a2567e Fix the logout path when not using the router

Author: nicolas-grekas

src/Symfony/Bundle/SecurityBundle/Templating/Helper/LogoutUrlHelper.php

@@ -101,7 +101,7 @@ private function generateLogoutUrl($key, $referenceType)
         if ('/' === $logoutPath[0]) {
             $request = $this->container->get('request');
 
-            $url = UrlGeneratorInterface::ABSOLUTE_URL === $referenceType ? $request->getUriForPath($logoutPath) : $request->getBasePath().$logoutPath;
+            $url = UrlGeneratorInterface::ABSOLUTE_URL === $referenceType ? $request->getUriForPath($logoutPath) : $request->getBaseUrl().$logoutPath;
 
             if (!empty($parameters)) {
                 $url .= '?'.http_build_query($parameters);