Issue #2338571 by znerol: Remove SessionManager::startLazy().

core/authorize.php

core/includes/install.core.inc

core/lib/Drupal/Core/Authentication/Provider/Cookie.php

core/lib/Drupal/Core/DrupalKernel.php

core/lib/Drupal/Core/Session/SessionManager.php

core/lib/Drupal/Core/Session/SessionManagerInterface.php

core/modules/system/src/Tests/Entity/EntityCrudHookTest.php

...odules/entity_crud_hook_test/entity_crud_hook_test.module

...tem/tests/modules/service_provider_test/src/TestClass.php

...stem/tests/modules/session_test/session_test.services.yml

...ession_test/src/EventSubscriber/SessionTestSubscriber.php