Improvements to tests to enable pytest

[moto-timo]

In the Yocto Project/OpenEmbedded we typically run our python tests with pytest --automake. This pull request makes the import of tests.utils more explicit so that pytest finds the modules. Also convert line endings of test_functionality.py from DOS/Windows to Unix like the other files in tests/.

[moto-timo]

All tests passed: https://github.com/moto-timo/yappi/actions/runs/7316074054

[sumerc]

Thanks!