Don't skip Cloudflare unspoofable client IP test
Don't skip Cloudflare unspoofable client IP test

Cloudflare have promised this feature and we need it, so let it fail for
now as a reminder that this isn't yet implemented.

alphagov/cdn-acceptance-tests,alphagov/cdn-acceptance-tests,mikepea/cdn-acceptance-tests,mikepea/cdn-acceptance-tests,mikepea/cdn-acceptance-tests,mikepea/cdn-acceptance-tests,alphagov/cdn-acceptance-tests,alphagov/cdn-acceptance-tests