Issue #2241405 by djevans: Update Block example to use *.menu_links.yml, add tests.
Branch blocker: node_type_example now puts its yml files in the proper place.
Branch blocker: simpletest_example now puts its content type in the proper folder. Also changed unit test example name for easy searching on the testing page.
Merge branch '8.x-1.x' into 8.x-1.x-field_example