[Test suite] Restore support for ignored tests in CI

[fermino]

After the initial "migration" to pytest in #675 there are some tests being ignored due to lack of support from pytest.

I will look into that so that the CI workflow can cover the most cases possible. This issue is intented to keep track of the progress.

tests/test_formatters/test_py.py:19
  tests/test_formatters/test_py.py:19: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_paranoia will be ignored
    @parameterized(["python2", "python3"])

tests/test_formatters/test_sh.py:25
  tests/test_formatters/test_sh.py:25: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_basic will be ignored
    @with_setup(usual_setup_func, usual_teardown_func)

tests/test_formatters/test_sh.py:75
  tests/test_formatters/test_sh.py:75: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_paranoia will be ignored
    @parameterized([("sh", ), ("bash", ), ("dash", )])

tests/test_formatters/test_sh.py:144
  tests/test_formatters/test_sh.py:144: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_hardlink_duplicate_directories will be ignored
    @parameterized([("sh", ), ("bash", ), ("dash", )])

tests/test_formatters/test_sh.py:178
  tests/test_formatters/test_sh.py:178: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_remove_empty_dirs will be ignored
    @parameterized([

tests/test_formatters/test_sh.py:211
  tests/test_formatters/test_sh.py:211: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_remove_empty_dirs_with_dupe_dirs will be ignored
    @parameterized([

tests/test_formatters/test_sh.py:244
  tests/test_formatters/test_sh.py:244: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_cleanup_emptydirs will be ignored
    @with_setup(usual_setup_func, usual_teardown_func)

tests/test_formatters/test_sh.py:275
  tests/test_formatters/test_sh.py:275: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_keep_parent_timestamps will be ignored
    @with_setup(usual_setup_func, usual_teardown_func)

tests/test_mains/test_hash.py:32
  tests/test_mains/test_hash.py:32: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_hash_function will be ignored
    @parameterized([

tests/test_options/test_cache.py:79
  tests/test_options/test_cache.py:79: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_xattr_detail will be ignored
    @parameterized([("", ), ("-D", )])

tests/test_options/test_cache.py:168
  tests/test_options/test_cache.py:168: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_clamp_xattr_false_negative will be ignored
    @parameterized([('-q 1',), ('-Q 1',), ('-q 50%',), ('-Q 50%',)])

tests/test_options/test_cache.py:190
  tests/test_options/test_cache.py:190: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_clamp_xattr_false_positive will be ignored
    @parameterized([('-q 2',), ('-Q 1',), ('-q 70%',), ('-Q 50%',)])

tests/test_options/test_merge_directories.py:15
  tests/test_options/test_merge_directories.py:15: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_simple will be ignored
    @parameterized([((),), (('--write-unfinished',),)])

tests/test_options/test_size.py:67
  /home/runner/work/rmlint/rmlint/tests/test_options/test_size.py:67: DeprecationWarning: invalid escape sequence '\-'
    trigger('--size \-\-17')

tests/test_options/test_stdin.py:86
  tests/test_options/test_stdin.py:86: PytestCollectionWarning: yield tests were removed in pytest 4.0 - test_stdin_empty will be ignored
    @parameterized([('-',), ('-0',), ('-D', '-')])