* Fix encoding issues with file paths.
Discovered while testing with ANSIBLE_CONFIG env var set to a path
that contained unicode characters while LC_ALL=C.
* Fix unit tests.
* Fix another path encoding issue.
* 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.
Only print warning when ansible.cfg is actually skipped
* Also add unittests for the find_ini_config_file function
* Add documentation on world writable current working directory
config files can no longer be loaded from a world writable current
working directory but the end user is allowed to specify that
explicitly. Give appropriate warnings and information on how.
Fixes#42388
