Issue #3427176 by mondrake, longwave: Replace calls to ::expectWarning*() from Drupal\Tests\Core\EventSubscriber\SpecialAttributesRouteSubscriberTest

Issue #2917331 by catch, martin107, Deepak Goyal, longwave, andypost, ravi.shankar, alexpott, daffie, larowlan: Decouple from Symfony CMF

Revert "Issue #2917331 by catch, martin107, Deepak Goyal, longwave, andypost, ravi.shankar, daffie, larowlan: Decouple from Symfony CMF"

This reverts commit 98eed2b1.

Issue #2917331 by catch, martin107, Deepak Goyal, longwave, andypost, ravi.shankar, daffie, larowlan: Decouple from Symfony CMF

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2364467 by Mile23, neclimdul: SpecialAttributesRouteSubscriber::onAlterRoutes() doesn't return a value

Issue #2286971 by znerol, Berdir, almaudoh, cilefen: Remove dependency of current_user on request and authentication manager

Issue #2334785 by znerol: Remove _maintenance request attribute from SpecialAttributesRouteSubscriber.

Issue #2158571 by tstoeckler, dawehner, kgoel, tim.plunkett, catch, effulgentsia: Routes added in RouteSubscribers cannot be altered.

Issue #2102417 by damiankloip, dawehner: Change Drupal\Core\Routing\RouteBuildEvent::getModule() to getProvider().

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

Issue #2098795 by tim.plunkett, Sean Charles, tstoeckler, dawehner, larowlan, damiankloip: Create Base Class for RouteSubscriber Class.