Update CI Linter #31
Description
Currently the workflows in our CI perform flake8 checks on the python code in order to produce lint errors. However, these checks only execute on the toynet-flask/flasksrc directory. Expand these lint checks to also address the following folders and resolve any lint errors that arise:
toynet-flask/teststoynet-flask/toynet_mininet/flasksrctoynet-flask/toynet_mininet/teststoynet-flask/toynet_mininet/utiltoynet-flask/toynet_mininet/toynet
Additionally, update the Makefiles so that a call to make lint will run the appropriate lint checks locally; the README should also be updated to show that the developer needs to install flake8 via pip3 for this functionality.