Turn logging on by default with PYTHONUNBUFFERED = True

[kentbull]

Feature request description/rationale

This will help newcomers avoid wasting tons of time. We should default PYTHONUNBUFFERED to True.

[kentbull]

I am referring specifically to the weboftrust/keri, keria, witness, and other Docker images. They should all default to PYTHONUNBUFFERED as True. If people need better performance by turning this off then they can manually set it to false.

[pfeairheller]

This issue refers to Docker images, not code changes in KERIpy

[kentbull]

Yes, that's right, just for the docker images. I'll submit a PR.