* Update ansible-test collection inventory handling.
- The `windows-integration` command now supports the `--inventory` option.
- The incomplete support for host_vars and group_vars directories has been removed.
- The incomplete support for an inventory directory has been removed.
- The inventory specified by `--inventory` can now reside outside the install and content roots.
- Using `ansible_ssh_private_key_file` with `--docker` or `--remote` results in a warning about the combination being unsupported and likely to fail.
* Fix config handling.
* Fix payload handling of ssh keys.
* Disable pylint no-self-use rule for ansible-test.
* De-duplicate payload paths.
* 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.