nghttp2-asio: resolve numeric IPv6 server address

[sgsx3]

The boost library refuses to resolve a numeric IPv6 host (::1) because its resolver flags are set to 'address_configured' by default. This patch simply runs an additional query in such a case with flags set to 'numeric_host'.

See https://www.boost.org/doc/libs/1_83_0/doc/html/boost_asio/reference/ip__resolver_base.html for more info.

Description

Checklist

Tick relevant boxes, this PR is-a or has-a:

• Bugfix
  • Regression tests
  • ChangeLog updates (for next release)
• Feature
  • YANG model change => revision updated?
  • Regression tests added?
  • ChangeLog updates (for next release)
  • Documentation added?
• Test changes
  • Checked in changed Readme.adoc (make test-spec)
  • Added new test to group Readme.adoc and yaml file
• Code style update (formatting, renaming)
• Refactoring (please detail in commit messages)
• Build related changes
• Documentation content changes
  • ChangeLog updated (for major changes)
• Other (please describe):

[mattiaswal]

Thanks for your contribution! This bug really haunts me on the nights, if this is the fix, why does it work for us to resolve with our aarch64 platform (and on x86).

So much unclear right now, have you reproduced it on x86 (Virtual)?

But during the exploring of this bug we at least found a related bug:
the /etc/hosts file does not mention ::1 (as it should)

Just some small things:

• Add fix R2S rousette crash on boot if LAN not connected #751 in your PR description.

[troglobit]

Agreed, very weird that it works in our primary use-cases when we completely remove all IPv6 addresses except the one on loopback 🤔

@sgsx3 please also update the ChangeLog, and tick the boxes in the checklist. Maybe a bit formal, but we've tried to make it so we can follow changes back to issues when looking for future bugs (answers the question: "why is this code here?"). We've tried to outline this in the Contributing Guidelines. Thanks!

[mattiaswal]

Does it work if you use an IPv4 address, (change in rousette main.cpp to 127.0.0.1 or localhost)