[FrameworkBundle] added support for double-quoted strings in the extractor (closes #8797)
Merge branch '2.2' into 2.3

* 2.2:
  [FrameworkBundle] added support for double-quoted strings in the extractor (closes #8797)
  [SecurityBundle] Move format-dependent tests from SecurityExtensionTest

Conflicts:
	src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/SecurityExtensionTest.php