[test] make unittest_cwconfig.py does not depend on legacy cube machinery
By dropping legacy cube tests in various places.
[tox]
envlist = py27,py3,flake8
[testenv]
deps =
pytest
commands =
{envpython} -m pytest {posargs:test}
[testenv:flake8]
basepython = python3
skip_install = true
deps =
flake8
commands = flake8
[flake8]
exclude = cubicweb_%(cubename)s/migration/*,test/data/*,.tox/*