Refactor logging for coin_testresults_parser

Instead of using custom prints, the module should use the logging module for printing to cooperate best with the script that imports it.

As a first thing in the script you can do:

import logging
L = logging.getLogger(__name__)

This will import the logger as is defined in the main script or define a new one if the module is running standalone.

And then you can do the following whenever you want to print:

L.debug()
L.info()
L.warning()
L.error()

Etc. Check the logging documentation. Some attention is needed in the formatting, most times it is needed to use %s placeholders to be replaced with the arguments that follow.

Check existing files like coin_util.py for example.