Issue #2264179 by Gábor Hojtsy, vijaycs85, alexpott, benjy: Clarify use of property/undefined and add an ignore type in configuration schema.
Issue #1289536 by RobLoach, Crell, Pancho, pounard, socketwench, fgm, dawehner, scor, tim.plunkett, larowlan, ParisLiakos: Switch Watchdog to a PSR-3 logging framework.
Issue #2267753 by pwolanin, amateescu, YesCT, Berdir: ContentEntityDatabaseStorage::mapToStorageRecord  hard-codes ->->value.
Issue #2259823 by beejeebus, Wim Leers: Make cache->created be to the millisecond.
Issue #2267329 by tim.plunkett | joachim: Move EntityWithPluginBagInterface out of Drupal\Core\Config\Entity and make it useful for more than one bag.
Issue #2268801 by tim.plunkett: Update ConditionInterface to use recently added plugin interfaces.
Issue #2096899 by amateescu, msonnabaum | Berdir: Add ::create() to simplify creating new entities.
Issue #2039435 by Xano, Berdir | akshay.swnt22: Convert EntityManager to extend DefaultPluginManager.
Issue #2226871 by tim.plunkett: ConfirmFormInterface::getCancelRoute() should always return Drupal\Core\Url.
Revert "Issue #2228215 by znerol, Berdir: Remove module check in DrupalKernel."

This reverts commit 341b903d05fb1d8cc2137df2543cf784eccfd568.
Issue #2228215 by znerol, Berdir: Remove module check in DrupalKernel.
Issue #2259275 by filijonka, sun, Xano: Rename "DrupalUnitTestBase" to KernelTestBase.
Issue #2270339 by YesCT, martin107:  is a misleading variable name in TokenReplaceUnitTestBase.
Issue #2178795 by tim.plunkett, jlbellido, YesCT, Berdir, Xano: Allow DiscoveryInterface::getDefinition() to throw an exception for an invalid plugin.
Issue #2178795 follow-up by tim.plunkett: Fix conflict with recently committed patch.
Issue #2269453 by olli: Apc_fetch() expects a string or array of strings.
Issue #2236167 by znerol: Use request stack in cache contexts.
Revert "Issue #1289536 by RobLoach, Crell, Pancho, pounard, socketwench, fgm, dawehner, scor, tim.plunkett, larowlan, ParisLiakos: Switch Watchdog to a PSR-3 logging framework."

This reverts commit ef250ba2cb737d7b575321095a518c7ca8193d18.
Issue #2271025 by Wim Leers: Don't let menu_navigation_links() set the active class, the drupal.active-links library does that for us (plus, it's setting it incorrectly).
Issue #2272267 by tim.plunkett: Entity_page_access() and entity_page_create_access() are dead code.