Merge pull request #7613 from s0undt3ch/hotfix/lint

Some PEP8 Lint fixes
Add fileserver_backend to master configuration page
Improve formatting for s3fs fileserver documentation
Delete the Nic classes from my previous implemntation

Not sure what I did, but when I was squashing, I accidently this in.
Remove unneeded reference to service_url in s3 fileserver docs
Merge pull request #7617 from ajithhub/remove_nic_classes

Delete the Nic classes from my previous implemntation
Merge pull request #7618 from s0undt3ch/hotfix/lint

The `pep8` lint library is not that great.
Fix PEP-8 E302
Fix PEP-8 E302