Developer should be able to run ansible-navigator test suite even if they have an /etc/ansible/ansible.cfg file

[ssbarnea]

At his moment, if someone is trying to run tox -e py, they might be asked to remove the /etc/ansible/ansible.cfg before testing.

This is a real issue because this file is part of ansible rpm distribution and created by default, as only having comments.

Instead of failing to run the tests or asking the user to perform an action as root, we should find other ways to avoid using the file.