codeql PEP8 first argument should be self

[jsoref]

Short description

codeql complains (per PEP8) when the first argument to methods is not self: https://github.com/check-spelling-sandbox/pdns/security/quality/rules/py%2Fnot-named-self

Checklist

I have:

• [x] read the CONTRIBUTING.md document
• [x] read and accepted the Developer Certificate of Origin document, including the AI Policy, and added a "Signed-off-by" to my commits
• [ ] compiled this code
• [ ] tested this code
• [ ] included documentation (including possible behaviour changes)
• [ ] documented the code
• [ ] added or modified regression test(s)
• [ ] added or modified unit test(s)
• [ ] checked that this code was merged to master