Merge branch '2.7' into 2.8

* 2.7:
  backport GlobTest from 2.7 branch
  [FrameworkBundle] Remove unused code in test
  [2.3] Fixed an undefined variable in Glob::toRegex
  simplified a test
  fix container cache key generation
  [Form] fix option name in changelog
  [Translation] Add resources from fallback locale
  [DependencyInjection] enforce tags to have a name
  [YAML] Refine the return value of Yaml::parse()

Author: fabpot