feature: Do not log IP address

[raphaelm]

Is your feature request related to a problem? Please describe.
For privacy reasons, we do not want to permanently store IP addresses in hour logs.

Describe the solution you'd like
An option to have X-Real-IP redacted from the syslog output.

Describe alternatives you've considered
Not setting X-Real-IP at all, but that gives anubis less information to act on

Additional context
Syslog lines include "x-real-ip":"2804:d55:…"

[Xe]

The beautiful part of this is that some people hard depend on the IP address being logged for fail2ban. I'll probably have to make this a config file option.

[raphaelm]

I suspected as much :(

[raphaelm]

#1299 allows for "less logging" but doesn't really remove the sensitive information (IP addresses), does it?