The print statements from app.py appear in bursts, with long delays between bursts.

• Even the initial "Starting rovercode service" print is delayed.
• The problem seems to be only with printing -- the server still runs and responds to a GET on the / endpoint.
• This does not seem to be related to @jeeshofone's logging changes in the upcoming systemd service installation. It happens now in the standard docker install.
• Increasing the sensor polling period to 20 seconds did not improve the problem.
• Commenting out all socketio.start_background_task() and socketio.run() made the problem go away.
• Using the debugging server instead of eventlet behind socketio did not help.
• This thread suggested sprinkling in some socketio.sleep(0)s to release the CPU. I put them a lot of places, with no effect.
• That thread also suggested monkey_patching with eventlet. We should probably add that, but it didn't seem to fix the problem.