C0103 fixes 2

Changes to constants
Yes, I just noticed it too. I should have noticed the error when I ran pylint. But for some reason I have lots of import-errors like this: `node/ws.py:  4: [F:import-error] -- Unable to import 'pycountry' and therefore missed the import error among all the chaff.
Can you tell me why I have so many import-errors when running pylint? It is on all branches not only mine. Did I setup something incorrectly?