* Remove vendored copy of ipaddress.
* Forgot an import.
* Remove sanity ignores and checks related to ipaddress.
* Remove octal IPv4 address.
Such IPs are no longer accepted by ipaddress in Python's standard library (CVE-2021-29921).
* Remove unused import.
Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>
Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>