* Add custom action class for version info
* Use args from CLI as prog for ArgumentParser object
* Make prog a required parameter of create_base_parser() and update all uses to pass in the newly required parameter.
* Add unit test for checking ansible --version
* Update other related unit tests
* Move ansible.compat.tests to test/units/compat/.
* Fix unit test references to ansible.compat.tests.
* Move builtins compat to separate file.
* Fix classification of test/units/compat/ dir.