Not sure if it's in the scope of this issue but I thought I'd report it.

I've just hit a similar issue with `setup.cfg` under Python 3.8 which is supposed to be parsed by `setuptools` but for some reason, I only see `distutils` in the trace, coming from `pip`.

```
$ python -m pip install --upgrade tox
ERROR: Exception:
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 186, in _main
    status = self.run(options, args)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 253, in run
    options.use_user_site = decide_user_install(
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 604, in decide_user_install
    if site_packages_writable(root=root_path, isolated=isolated_mode):
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 549, in site_packages_writable
    test_writable_dir(d) for d in set(get_lib_location_guesses(**kwargs))
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 543, in get_lib_location_guesses
    scheme = distutils_scheme('', *args, **kwargs)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/pip/_internal/locations.py", line 109, in distutils_scheme
    d.parse_config_files()
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/distutils/dist.py", line 413, in parse_config_files
    val = parser.get(section,opt)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/configparser.py", line 799, in get
    return self._interpolation.before_get(self, section, option, value,
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/configparser.py", line 395, in before_get
    self._interpolate_some(parser, option, L, value, section, defaults, 1)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/configparser.py", line 442, in _interpolate_some
    raise InterpolationSyntaxError(
configparser.InterpolationSyntaxError: '%' must be followed by '%' or '(', found: '%3Adevel\nCode of Conduct = https://docs.ansible.com/ansible/latest/community/code_of_conduct.html\nSource Code = https://github.com/ansible/pylibssh'
```
(https://github.com/ansible/pylibssh/runs/640262804?check_suite_focus=true#step:7:32)

This is caused by
```
diff --git a/setup.cfg b/setup.cfg
index 9318235..0455376 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,7 +9,7 @@ version = 0.0.1.dev1
 url = https://github.com/ansible/pylibssh
 project_urls =
     Bug Tracker = https://github.com/ansible/pylibssh/issues
-    CI: Travis = https://travis-ci.com/ansible/pylibssh
+    CI: GitHub Workflows = https://github.com/ansible/pylibssh/actions?query=branch%3Adevel
     Code of Conduct = https://docs.ansible.com/ansible/latest/community/code_of_conduct.html
     Source Code = https://github.com/ansible/pylibssh
 description = Python bindings for libssh client specific to Ansible use case
```