Listen at 127.0.0.11 (docker compatibility, nginx)

[roberth]

Is it feasible for dnsname to listen at 127.0.0.11? This address is used by docker and some containers assume this to work, hardcoding the address. On podman otoh, places the dns server in the container network range.
Of course hardcoding 127.0.0.11 isn't great form, but it's out there in the wild and supporting it will improve dnsname usability.
For instance, it will help with nginx's resolver config item, which must be set for nginx to resolve names dynamically instead of at startup only.

[rhatdan]

@baude @Luap99 @mheon WDYT?

[Luap99]

This is something we have to consider for the network rewrite. If we write a new dns server we should definitely do this to not block port 53 on the host.