Merge branch '7.4' into 8.1

* 7.4:
  [Console] [FrameworkBundle] Adapt merged tests to the 7.4 APIs
  [Console] Keep messages containing malformed UTF-8 when wrapping
  [Finder] Only treat a leading hash as a gitignore comment and strip trailing spaces only
  [FrameworkBundle] Fix the fatal when a cache pool cannot be cleared
  [Mailer] Reconnect when the server closed the transmission channel
  [Finder] Fix building the gitignore regex for files with many patterns
  [Finder] Fix ignoreVCSIgnored() when the search directory is reached through a symlink

# Conflicts:
#	src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php