Merge remote branch 'upstream/8.x' into kernel

core/lib/Drupal/Component/Archiver/ArchiveTar.php

core/lib/Drupal/Component/Archiver/ArchiverInterface.php

core/lib/Drupal/Component/Archiver/Tar.php

core/lib/Drupal/Component/Archiver/Zip.php

core/modules/image/config/image.style.large.xml

core/modules/image/config/image.style.medium.xml

core/modules/image/config/image.style.thumbnail.xml

core/modules/system/system.api.php

core/modules/system/system.info

core/modules/system/system.module

core/modules/update/tests/update_test.module