[VarDumper] Minor fix for the uniformity
[2.6] silence deprecation notices in new components
minor #13099 [2.6] silence deprecation notices in new components (nicolas-grekas)

This PR was merged into the 2.6 branch.

Discussion
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[2.6] silence deprecation notices in new components

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

Commits
-------

b0a156f [2.6] silence deprecation notices in new components
Merge branch '2.6' into 2.7

* 2.6:
  [2.6] silence deprecation notices in new components
  [2.5] silence deprecation notices in new components
  [VarDumper] Minor fix for the uniformity
  [TwigBundle] added missing absolute URL in Twig exceptions

Conflicts:
	src/Symfony/Bundle/DebugBundle/phpunit.xml.dist
	src/Symfony/Component/ExpressionLanguage/phpunit.xml.dist
	src/Symfony/Component/Security/Acl/phpunit.xml.dist
	src/Symfony/Component/Security/Core/phpunit.xml.dist
	src/Symfony/Component/Security/Csrf/phpunit.xml.dist
	src/Symfony/Component/Security/Http/phpunit.xml.dist
	src/Symfony/Component/VarDumper/phpunit.xml.dist
Merge branch '2.7'

* 2.7:
  [Security/Http] fix mock logger in test
  [Serializer] Fix XmlFileLoader test
  [2.6] silence deprecation notices in new components
  [2.5] silence deprecation notices in new components
  [VarDumper] Minor fix for the uniformity
  [TwigBundle] added missing absolute URL in Twig exceptions