[Validator] Made sure that context changes don't leak out of (Contextual)ValidatorInterface
[Validator] Fixed doc block
[Validator] Added markObjectAsInitialized() and isObjectInitialized() to ExecutionContextInterface
bug #11412 [Validator] Made sure that context changes don't leak out of (Contextual)ValidatorInterface (webmozart)

This PR was merged into the 2.5 branch.

Discussion
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[Validator] Made sure that context changes don't leak out of (Contextual)ValidatorInterface

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11046
| License       | MIT
| Doc PR        | -

Commits
-------

ff48939 [Validator] Added markObjectAsInitialized() and isObjectInitialized() to ExecutionContextInterface
14b60c8 [Validator] Fixed doc block
91bf277 [Validator] Made sure that context changes don't leak out of (Contextual)ValidatorInterface
Merge branch '2.5'

* 2.5:
  Update validators.eu.xlf
  fixed CS
  remove unused imports
  [Validator] Added markObjectAsInitialized() and isObjectInitialized() to ExecutionContextInterface
  [Validator] Fixed doc block
  [Routing] simplify the XML schema file
  Unify null comparisons
  [EventDispatcher] don't count empty listeners
  [Process] Fix unit tests in sigchild environment
  [Process] fix signal handling in wait()
  [BrowserKit] refactor code and fix unquoted regex
  Fixed server HTTP_HOST port uri conversion
  [HttpFoundation] moved test file to the right directory
  [Validator] Made sure that context changes don't leak out of (Contextual)ValidatorInterface
  [MonologBridge] fixed Console handler priorities
  Bring code into standard
  [Process] Add test to verify fix for issue #11421
  [Process] Fixes issue #11421
  [DependencyInjection] Pass a Scope instance instead of a scope name.