Workaround this error:

    TASK [tox : Install any sibling python packages] ***
    An exception occurred during task execution. To see the full traceback, use -vvv.
    The error was: command terminated with exit code 1
    fatal: [molecule]:
    FAILED! => {
        "changed": false,
        "module_stderr":
          "Traceback (most recent call last):
           File '<stdin>', line 114, in <module>
           File '<stdin>', line 106, in _ansiballz_main
           File '<stdin>', line 49, in invoke_module
           File '/tmp/ansible_tox_install_sibling_packages_payload_XzqBVa/__main__.py', line 55, in <module>
             ImportError: No module named pkg_resources
             command terminated with exit code 1",
        "rc": 1
    }