Made optimization deprecating modulus operator
minor #11574 [Security] Made optimization on constant-time algorithm removing modulus operator (yosmanyga)

This PR was merged into the 2.3 branch.

Discussion
----------

[Security] Made optimization on constant-time algorithm removing modulus operator

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

This fix improves the constant-time algorithm used to compare strings, as it removes the `%` operator inside the loop.

Commits
-------

000bd0d Made optimization deprecating modulus operator
fixing typo in a comment
Merge branch '2.3' into 2.4

* 2.3:
  [HttpKernel] fixed internal fragment handling
  fixing yaml indentation
  [WebProfiler] replaced the import/export feature from the web interface to a CLI tool
  Forced all fragment uris to be signed, even for ESI
  Add tests and more assertions
  [FrameworkBundle][Translator] Validate locales.
  [HttpFoundation] added some missing tests
  [HttpFoundation] Improve string values in test codes
  fix comment: not fourth but sixth argument
  fixing typo in a comment
  [FrameworkBundle] fixed CS
  [FrameworkBundle] PhpExtractor bugfix and improvements
  [Finder] Fix findertest readability
  [Filesystem] Add FTP stream wrapper context option to enable overwrite (override)
  fix parsing of Authorization header
  Test examples from Drupal SA-CORE-2014-003
  Fix potential DoS when parsing HOST
  Made optimization deprecating modulus operator

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Resources/config/esi.xml
	src/Symfony/Component/HttpFoundation/Request.php
	src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
	src/Symfony/Component/HttpKernel/Fragment/EsiFragmentRenderer.php