Issue #1551140 by Berdir, fago: Remove stub entities, replace entity_create_stub_entity().

core/modules/entity/entity.module

core/modules/entity/lib/Drupal/entity/EntityFieldQuery.php

core/modules/field/field.crud.inc

core/modules/field/field.module

core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php

core/modules/field/lib/Drupal/field/Tests/CrudTest.php

core/modules/field/lib/Drupal/field/Tests/DisplayApiTest.php

...les/field/lib/Drupal/field/Tests/EntityPropertiesTest.php

...les/field/lib/Drupal/field/Tests/FieldAttachOtherTest.php

...s/field/lib/Drupal/field/Tests/FieldAttachStorageTest.php

core/modules/field/lib/Drupal/field/Tests/FormTest.php

.../modules/field/lib/Drupal/field/Tests/TranslationTest.php

...ib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php

...ons/lib/Drupal/options/Tests/OptionsDynamicValuesTest.php

...les/options/lib/Drupal/options/Tests/OptionsFieldTest.php

...s/options/lib/Drupal/options/Tests/OptionsWidgetsTest.php

...ield/modules/text/lib/Drupal/text/Tests/TextFieldTest.php

...ules/field/tests/modules/field_test/field_test.entity.inc

.../modules/field/tests/modules/field_test/field_test.module

...les/field/tests/modules/field_test/field_test.storage.inc