_SELF name should not trigger WPS117

[sobolevn]

server/settings/components/csp.py

  11:1     WPS117 Found name reserved for first argument: _SELF
  _SELF = "'self'"
  ^

We also need to check names like _Self and Self, they should be fine.

[ApostolFet]

It seems sufficient to replace the use of the logic.is_wrong_name function with the in operator https://github.com/wemake-services/wemake-python-styleguide/blob/master/wemake_python_styleguide/visitors/ast/naming/validation.py#L116

[Burka111]

I've encountered a similar issue when working with Django models. Implementing a custom validator function resolved the problem for me. Has anyone else tried this approach? 😄