distutils import is problematic (causes error with frozen tests)

[The-Compiler]

distutils is a somewhat weird biest, and it's used in #27. I thought a simple util method would be okay while reviewing - turns out I was wrong.

I get this when trying to run the tests frozen via cx_Freeze:

C:\projects\qutebrowser\.tox\unittests-frozen\build\library.zip\distutils\__init__.py:14: UserWarning: The virtualenv distutils package at %s appears to be in the same location as the system distutils?
Traceback (most recent call last):
  File "C:\projects\qutebrowser\.tox\unittests-frozen\lib\site-packages\cx_Freeze\initscripts\Console.py", line 27, in <module>
    exec(code, m.__dict__)
  File "scripts/dev/run_frozen_tests.py", line 27, in <module>
    import pytest_mock
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
  File "C:\projects\qutebrowser\.tox\unittests-frozen\lib\site-packages\pytest_mock.py", line 5, in <module>
    from distutils.util import strtobool
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2212, in _find_and_load_unlocked
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 321, in _call_with_frames_removed
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
  File "c:\python\32-bit\3.4\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
  File "C:\projects\qutebrowser\.tox\unittests-frozen\lib\distutils\__init__.py", line 25, in <module>
    from distutils import dist, sysconfig
ImportError: cannot import name 'dist'

I guess it'd be better to just do {'false': False, 'true': True}[val.lower()] or so.

cc @Chronial

[nicoddemus]

Today I thought with myself "I think I will test packages with devpi after this release"... well, what do you know! 😅

I'm working on a fix as well.

[nicoddemus]

Release 0.10.1, thanks! 😄

[Chronial]

Sorry 😄. I actually had it like this before – that's why there is this test: 773f8d9#diff-7cc07d0976b2f8543c7956925eb81df9R334

But then I really disliked doing something this basic ourselves and found the distutils function... ^^.

[The-Compiler]

For the record, I think it'd make a lot of sense having this utility function added to the pytest core for plugins to use. Want to make a PR by any chance? 😆