6.0.0: pyutilib uses `nose` which outdated

[kloczek]

https://nose.readthedocs.io/en/latest/
It woild be good to migrate to pytest.

+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-pyutilib-6.0.0-3.fc35.x86_64/usr/lib64/python3.8/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-pyutilib-6.0.0-3.fc35.x86_64/usr/lib/python3.8/site-packages
+ /usr/bin/pytest -ra --import-mode=importlib
=========================================================================== test session starts ============================================================================
platform linux -- Python 3.8.11, pytest-6.2.5, py-1.10.0, pluggy-0.13.1
benchmark: 3.4.1 (defaults: timer=time.perf_counter disable_gc=False min_rounds=5 min_time=0.000005 max_time=1.0 calibration_precision=10 warmup=False warmup_iterations=100000)
Using --randomly-seed=718497421
rootdir: /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0
plugins: forked-1.3.0, shutil-1.7.0, virtualenv-1.7.0, expect-1.1.0, flake8-1.0.7, timeout-1.4.2, betamax-0.8.1, freezegun-0.4.2, aspectlib-1.5.2, toolbox-0.5, rerunfailures-9.1.1, requests-mock-1.9.3, cov-2.12.1, flaky-3.7.0, benchmark-3.4.1, xdist-2.3.0, pylama-7.7.1, datadir-1.3.1, regressions-2.2.0, cases-3.6.3, xprocess-0.18.1, black-0.3.12, anyio-3.3.0, asyncio-0.15.1, trio-0.7.0, subtests-0.5.0, isort-2.0.0, hypothesis-6.14.6, mock-3.6.1, profiling-1.7.0, randomly-3.8.0, Faker-8.12.1, nose2pytest-1.0.8, pyfakefs-4.5.1, tornado-0.8.1
collected 590 items / 1 error / 589 selected

================================================================================== ERRORS ==================================================================================
_____________________________________________________ ERROR collecting pyutilib/component/config/tests/test_config.py ______________________________________________________
ImportError while importing test module '/home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/component/config/tests/test_config.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
pyutilib/component/config/tests/test_config.py:11: in <module>
    from nose.tools import nottest
E   ModuleNotFoundError: No module named 'nose'
============================================================================= warnings summary =============================================================================
pyutilib/component/config/tests/test_options.py:155
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/component/config/tests/test_options.py:155: DeprecationWarning: invalid escape sequence \<
    if re.match("\<Option \[globals\] 'o1'\>",

pyutilib/component/config/tests/test_options.py:160
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/component/config/tests/test_options.py:160: DeprecationWarning: invalid escape sequence \<
    re.match("\<Option \[globals\] 'o1'\>", str(ep.service("o1"))) is

pyutilib/component/config/tests/test_options.py:163
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/component/config/tests/test_options.py:163: DeprecationWarning: invalid escape sequence \<
    re.match("\<Option \[foo\] 'o2'\>", str(ep.service("o2"))) is None)

pyutilib/dev/tests/test_runtests.py:30
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/dev/tests/test_runtests.py:30: DeprecationWarning: invalid escape sequence \S
    g = re.match('(\S+) \(([^\)]+)\)', line)

pyutilib/misc/tests/test_config.py:1076
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/misc/tests/test_config.py:1076: DeprecationWarning: invalid escape sequence \{
    stripped_reference = re.sub('\{[^\}]*\}','',reference,flags=re.M)

pyutilib/misc/tests/test_misc.py:208
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/misc/tests/test_misc.py:208: DeprecationWarning: invalid escape sequence \
    ans = pyutilib.misc.quote_split(' ', "a b\ c")

pyutilib/misc/tests/test_misc.py:209
  /home/tkloczko/rpmbuild/BUILD/pyutilib-6.0.0/pyutilib/misc/tests/test_misc.py:209: DeprecationWarning: invalid escape sequence \
    self.assertEqual(ans, ["a", 'b\ c'])

-- Docs: https://docs.pytest.org/en/stable/warnings.html
========================================================================= short test summary info ==========================================================================
ERROR pyutilib/component/config/tests/test_config.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
======================================================================= 7 warnings, 1 error in 0.88s =======================================================================
pytest-xprocess reminder::Be sure to terminate the started process by running 'pytest --xkill' if you have not explicitly done so in your fixture with 'xprocess.getinfo(<process_name>).terminate()'.