Revert "Issue #2203271 by Xano: Undefined index "rows_order" in theme_field_ui_table()." contained another patch

This reverts commit a457090d.

Issue #2194445 by sun: Web tests of modules in a site-specific directory can no longer be run, because module is not in test site directory.

Issue #2194357 by alexpott, Berdir: CacheArray::__destruct() invoked after test tables have been removed.

Issue #2171683 by sun, alexpott, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Revert "Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead."

This reverts commit 91db25eb. Broke web
tests.

Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Issue #2162729 by TravisCarden, Xano, InternetDevels: "Sub-class must implement the getInfo method" not a helpful exception message.

Issue #1862202 by plach, Berdir, katbailey, ParisLiakos, alexpott, chx, sun, larowlan, Gábor Hojtsy, cosmicdreams, vijaycs85, YesCT, penyaskito, andypost, Albert Volkman, joelpitett: Objectify the language system.

Issue #2012566 by clemens.tolboom, Luka Zitnik: Naming confusion between config_comparer and storage_comparer in config.admin.inc and other places.

Issue #2130811 by alexpott, Gábor Hojtsy, vijaycs85, sun, Wim Leers: Use config schema in saving and validating configuration form to ensure data is consistent and correct.

Issue #2004086 by dawehner, pwolanin, katbailey, tim.plunkett, vijaycs85, fabpot: The Request service must be synthetic.

Issue #2073531 by tim.plunkett, dawehner, Berdir, catch, plach: Use current user service instead of _account, remove _account from the request object.

Issue #2014015 by kgoel, dmitrii, Berdir: Replace drupal_container() with Drupal::service() in the simpletest module.

Issue #2057259 by alexpott, cweagans, swentel: Fixed Malformed modulename.info.yml file causes fatal error.

Issue #338403 by klausi, jhodgdon, grisendo, YesCT, drewish: Use {@inheritdoc} on all class methods (including tests).

Issue #1969572 by neclimdul, larowlan, hussainweb, dawehner, damiankloip, ParisLiakos, pwieck, Berdir, socketwench: Make Uuid a service.

Issue #1614186 by RobLoach, tim.plunkett, msonnabaum, Crell, jhodgdon, Niklas Fiekas: Update coding standards for using 'native' PHP classes like stdClass in namespaced code.

Issue #2032453 by alexpott, tsphethean: Fixed WebTestBase::randomString returning a string containing a $ followed by a number causes assertLink() to fail it's xpath match.

Issue #2057869 by dawehner, jibran: Provide an alias for 'plugin.manager.entity' called 'entity.manager'.

Issue #1856766 by chx, Berdir, heyrocker, kim.pepper: Convert file_public_path() to the new settings system (make it not configurable via UI or YAML).

Issue #2032553 by pwolanin, Xano: Fixed The _account attribute on the Request is not available during web tests.