Simplify IP address normalizer with IP masks

[Altahrim]

Summary

• Try to simplify IP address normalizer with IP masks
• Removes dead code (subnet sizes were never used)
• Should be a little more efficient

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included

[kesselb]

Nice one 👍

We added https://github.com/mlocati/ip-lib as library recently.
Could we reuse some code from there?

[Altahrim]

Nice one +1

We added https://github.com/mlocati/ip-lib as library recently. Could we reuse some code from there?

Yes, I guess our normalizer can become some kind of wrapper around ip-lib but it will probably be a little more expensive.
It could maybe be part of another rewrite to make our normalizer more robust. Actually, I came to it because my webserver sent a unix socket instead of an IP address so my instance crashed.