Cleaned things up a bit. All the flake8 commands are clean, and I adding a few pylint commands to clean things up too.
We are at 95% total coverage with only img_utils.py just below 90% at 89%, I left that alone (other than generaral cleanup) since it's about to be factored into another module. Make 'plyint' changes for in .pylintrc and in metadata_utils.py and input_validation.py.
Description
Testing