Improve linter coverage

[jonathan-j-lee]

Is your feature request related to a problem? Please describe.
Over time, we've used pylint: disable to disable too many warnings. Also, the version of pylint we use for Runtime is very out-of-date, meaning there are potentially code style best practices that are not enforced.

Describe the solution you'd like

• Upgrade pylint version in Pipfile
• Eliminate disabled warnings ansible.py
• Eliminate disabled warnings runtime.py
• Eliminate disabled warnings runtimeUtil.py
• Eliminate disabled warnings in studentapi.py
• Eliminate disabled warnings in statemanager.py

When you run make lint from runtime, no errors should be reported.