bug symfony#25392 [HttpFoundation] Fixed default user-agent (3.X -> 4.X) (lyrixx)

This PR was merged into the 4.0 branch.

Discussion
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[HttpFoundation] Fixed default user-agent (3.X -> 4.X)

| Q             | A
| ------------- | ---
| Branch?       | 4.0
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#25390
| License       | MIT
| Doc PR        |

Commits
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ac007e1 [HttpFoundation] Fixed default user-agent (3.X -> 4.X)

Author: nicolas-grekas

src/Symfony/Component/HttpFoundation/Request.php

@@ -312,7 +312,7 @@ public static function create($uri, $method = 'GET', $parameters = array(), $coo
             'SERVER_NAME' => 'localhost',
             'SERVER_PORT' => 80,
             'HTTP_HOST' => 'localhost',
-            'HTTP_USER_AGENT' => 'Symfony/3.X',
+            'HTTP_USER_AGENT' => 'Symfony',
             'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
             'HTTP_ACCEPT_LANGUAGE' => 'en-us,en;q=0.5',
             'HTTP_ACCEPT_CHARSET' => 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',