Add HTTPSignatureHeaderAuth.verify()

[sharpaper]

The class HTTPSignatureHeaderAuth inherits the method verify() that uses the default scheme="Authorization". It would be nice to override this method such that scheme="Signature" is set automatically:

class HTTPSignatureHeaderAuth(HTTPSignatureAuth):
    def verify(self, request, key_resolver):
        return super().verify(request, key_resolver, scheme="Signature")

[Georg Krause]

I just put this into a Merge Request, linked above. Please feel free to review and add any comments. Thanks for the suggestions.

[Andrey Kislyuk]

This is no longer an issue in the latest implementation, which uses only the "Signature-Input"/"Signature" scheme as described in the most recent draft.