Code style & linting posture at go-openapi

[fredbi]

This is an exchange about what should be our stance as published here: https://go-openapi.github.io/doc-site/contributing/style/index.html

Linting & relinting stuff is not fun, but necessary when (like us) you have to maintain many repos over a long period of time.

We use golangci-lint, but with a grain of salt: not blindly accepting defaults, not blindly following this or that linter's piece of advice. Feel free to add your point of view here.