Merge branch '2262863-image-srcset' of github.com:attiks/drupal into 2262863-image-srcset
Revert "Issue #2256405 by blueminds: VocabularyUnitTest and VocabularyTest are misnamed."

This reverts commit b293020054d2c7a0c9252bf59690a55b0a7ca847.
Issue #2256405 by blueminds: VocabularyUnitTest and VocabularyTest are misnamed.
Issue #2256405: VocabularyUnitTest and VocabularyTest are misnamed.
Issue #2263329 by dawehner: CommentDefaultFormatterCacheTagsTest just works because nothing uses AccountProxyInterface in HEAD.
Issue #2226395 by benjy | penyaskito: Expand Drupal6FieldInstance testing with a float field.
Issue #2263255 by alexpott: Cache.config only has a single key in it for config schema this seems a waste.
Issue #2122761 by znerol, heddn: SessionHttpsTest only runs half the tests.
Issue #2116551 by cam8001, amateescu, swentel, Xano | webchick: Fix the UX of Entity Reference fields.
Merge branch '8.x' into 2262863-image-srcset
Merge branch '2262863-image-srcset' of github.com:attiks/drupal into 2262863-image-srcset
Merge branch '2262863-image-srcset' into 2260061-picture-polyfill-2