[HttpFoundation] Fixed Request::getPort returns incorrect value under IPv6

Fixed issue with Request::getPort method returning an incorrect value when the HTTP_HOST header is a IPv6 address.
Small comment update according to PSR-2

See [PSR-2](http://www.php-fig.org/psr/psr-2/) paragraph 5.2

> There MUST be a comment such as `// no break` when fall-through is intentional in a non-empty case body.

Related to #11181
don't disable constructor calls to mockups of classes that extend internal PHP classes
minor #11187 [Tests] don't disable constructor calls to mockups of classes that extend intern... (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

[Tests] don't disable constructor calls to mockups of classes that extend intern...

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

Fixes the tests for the 2.3 branch as reported by @stof in #11176.

Commits
-------

2c726b8 don't disable constructor calls to mockups of classes that extend internal PHP classes
Merge branch '2.3' into 2.4

* 2.3:
  Added missing `break` statement
  don't disable constructor calls to mockups of classes that extend internal PHP classes
  Small comment update according to PSR-2
  [Console] Fixed notice in DialogHelper
  [HttpFoundation] Fixed Request::getPort returns incorrect value under IPv6
  [Filesystem] Fix test suite on OSX
  Add framework-bundle

Conflicts:
	src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
	src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/MongoDbSessionHandlerTest.php
Merge branch '2.4' into 2.5

* 2.4:
  fixed previous merge
  Added missing `break` statement
  don't disable constructor calls to mockups of classes that extend internal PHP classes
  Small comment update according to PSR-2
  [Console] Fixed notice in DialogHelper
  [HttpFoundation] Fixed Request::getPort returns incorrect value under IPv6
  [Filesystem] Fix test suite on OSX
  Add framework-bundle

Conflicts:
	src/Symfony/Bundle/TwigBundle/composer.json