* Relocate ansible-test self tests outside package.
We don't want to include the tests for verifying ansible-test within the ansible-test package.
* Add `test/ansible_test/` to classification.py.
* Fix test invocation.
* Relocate tests in MANIFEST.in.
* Improve package-data sanity test error checking.
* Only use includes for ansible-test in MANIFEST.in.
* Improve readability of MANIFEST.in.
* Move ansible-test units code into separate dir.
* Fix --explain on "code smell" sanity tests.
* Add --strict-markers to pytest invoctaion.
* Fix classification of units code changes.