Issue #2182439 by tim.plunkett: Provide a \Drupal::hasService() method.
Issue #2184591 by sun: system_rebuild_module_data() adds stale/obsolete 'files' property.
Issue #2184649 by tim.plunkett: Remove LinkGenerator::getActive() and LinkGenerator::setRequest().
Issue #1981418 by andypost, pcambra, tim.plunkett, dsdeiz, alweb: Drop taxonomy_vocabulary_sort().