Reformat all code with black

[mssalvatore]

Reformat all code with black. This is a prerequisite for #974.

• Create a configuration for black. Ensure travis uses the same configuration. (0d) - @shreyamalviya
• Edit travis config so that the build fails if black finds any formatting errors. (0d) - @mssalvatore
• Reformat all code with black (0d) <- Blocked by Build Prototype Monkey Island AppImage #1069 and Report refactoring #1068, partially blocked by Address Flake8 issues #1071
• Build monkey agents on jenkins and run blackbox and unit tests to ensure nothing wonky happened (0d) - @mssalvatore