just for cleanness -- make lint free

[yarikoptic]

❯ python -m flake8 datalad_container/extractors/tests/test_metalad_container.py
datalad_container/extractors/tests/test_metalad_container.py:1:1: F401 'os.path as op' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:3:1: F401 'sys' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:4:1: F401 'pathlib.Path' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:5:1: F401 'shutil.which' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:6:1: F401 'unittest.mock.patch' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:9:1: F401 'datalad.support.external_versions.UnknownVersion' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:19:1: F401 'datalad.api.Dataset' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:19:1: F401 'datalad.api.clone' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:24:1: F401 'datalad.cmd.StdOutCapture' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:24:1: F401 'datalad.cmd.WitlessRunner' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:28:1: F401 'datalad.support.exceptions.CommandError' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:29:1: F401 'datalad.tests.utils_pytest.assert_in' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:29:1: F401 'datalad.tests.utils_pytest.assert_raises' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:29:1: F401 'datalad.tests.utils_pytest.eq_' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:29:1: F401 'datalad.tests.utils_pytest.ok_exists' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:29:1: F401 'datalad.tests.utils_pytest.with_tree' imported but unused
datalad_container/extractors/tests/test_metalad_container.py:56:9: F841 local variable 'result' is assigned to but never used
datalad_container/extractors/tests/test_metalad_container.py:56:80: E501 line too long (84 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:58:1: E302 expected 2 blank lines, found 1
datalad_container/extractors/tests/test_metalad_container.py:67:25: E231 missing whitespace after ':'
datalad_container/extractors/tests/test_metalad_container.py:68:80: E501 line too long (85 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:71:80: E501 line too long (91 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:72:80: E501 line too long (85 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:73:80: E501 line too long (138 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:82:1: E302 expected 2 blank lines, found 1
datalad_container/extractors/tests/test_metalad_container.py:85:80: E501 line too long (83 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:88:11: E271 multiple spaces after keyword
datalad_container/extractors/tests/test_metalad_container.py:89:80: E501 line too long (80 > 79 characters)
datalad_container/extractors/tests/test_metalad_container.py:90:80: E501 line too long (101 > 79 characters)

[asmacdo]

Closed by #265