[HttpKernel] removed absolute paths from the generated container
bug #10894 [HttpKernel] removed absolute paths from the generated container (fabpot)

This PR was merged into the 2.3 branch.

Discussion
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[HttpKernel] removed absolute paths from the generated container

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | first step to resolve #6484, #3079, and #9238
| License       | MIT
| Doc PR        | n/a

This PR converts absolute paths to relative ones in the dumped container. The code is a bit "ugly", but it gets the job done and I'm not sure that there is a more elegant way without breaking everything.

Commits
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c1450b4 [HttpKernel] removed absolute paths from the generated container
Merge branch '2.3' into 2.4

* 2.3:
  [HttpFoundation] implement session locking for PDO
  [DomCrawler] Fixed the coding standards to use strict comparisons
  [HttpKernel] removed absolute paths from the generated container
  [DomCrawler] Fixed the initial state for options without value attribute
  Fixed the handling of boolean attributes in ChoiceFormField

Conflicts:
	src/Symfony/Component/DomCrawler/Tests/Field/ChoiceFormFieldTest.php
	src/Symfony/Component/HttpKernel/Tests/KernelTest.php