Use debug logging level

[seakrueger]

Read and write calls resulted in lots of spam to the info level logging, despite the information being logged not providing much info more debug positions.

[chrisruk]

Thanks for this pull request, I'm just wondering where you saw those info messages in your screenshot?

[seakrueger]

That specific screenshots originated from the journal (that's why there's two timestamps). The program defines its own loggers basic config,
logging.basicConfig(format='%(asctime)s - %(message)s', level=logging.INFO).

The actual motor code that results in the 40ms of logging is pretty simple,

def button_one(self):
        self.motor_b.start()

        self.wait()

        self.motor_b.stop()

self.wait() being just a simple sleep

[chrisruk]

Using debug level rather than info level seems a good idea, as the information
being logged is for debugging purposes.