This breaks detecting the project root when editing tests with a nested
pytest.ini file where other project files are available. The other files
are so common we can just removes this entirely and test that we
ignore it in one case.
* Add poetry support to python linters and black fixer.
* Update python.vim to detect poetry project.
* Update ale.vim, add an option for poetry `g:ale_python_auto_poetry`.
* Update ale-python.txt, add poetry support.
* Add and update poetry related tests.
Co-authored-by: unc0 <unc0@users.noreply.github.com>
