Conform to pep8 rules

[redphix]

What does this PR do?

Conforms to pep8 standards for all py files

[redphix]

ah nice I missed a few and the linter was able to catch it! Useful already!

[redphix]

There are still 5 errors, I want you to check them and see that fixing them wont cause some side effect. I am not comfortable changing these ones, as I don't understand them fully -- for example, there could be a reason why you might import something but not really use it in there, etc.

Also, although I have made changes carefully, it would still be good if you review them with a sharp eye as well -- better to be double sure.

[Reckless-Satoshi]

The 5 unused imports left as errors are fair: I do not think these will break anything.

I will build a coordinator image based on this PR and give it a test run to confirm everything still working.

[Reckless-Satoshi]

I will build a coordinator image based on this PR and give it a test run to confirm everything still working.

@redphix
Nothing in the trade pipeline, celery tasks, or other backend processes seems broken. Still many things I can't test quickly. But it looks okay to me to be merged. Let's also fix those 5 errors left, then we can run further tests on the Testnet platform in case something escaped.