Add flake8 lint test for other python files
Add flake8 lint test for other python files

Currently, the only other python files are the test suite.

ALikhachev/saltfs,UK992/saltfs,rwaweber/saltfs,servo/saltfs,UK992/saltfs,setupminimal/saltfs,setupminimal/saltfs,servo/saltfs,rwaweber/saltfs,rwaweber/saltfs,ALikhachev/saltfs,setupminimal/saltfs,ALikhachev/saltfs,UK992/saltfs