[Bug network/30544] [RFE] Make getaddrinfo() with hints ai_flags==AF_UNSPEC query only AF present on the system

["pemensik at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30544

--- Comment #2 from Petr Menšík <pemensik at redhat dot com> ---
Created test build with modified Fedora Rawhide branch.

On first glance, it behaves correctly.

Works:

- getent ahosts fedoraproject.org
- getent ahostsv4 fedoraproject.org
- getent ahostsv6 fedoraproject.org

As expected it offers only single address with "options edns0 ipv4" to ahosts.
But what were unexpected is reaction to ping.

# grep options /etc/resolv.conf 
options edns0 ipv4
# ping -6 fedoraproject.org
ping: fedoraproject.org: Address family for hostname not supported

# after modification
# grep options /etc/resolv.conf 
options edns0
# ping -c 1 -6 fedoraproject.org
PING fedoraproject.org(2620:52:3:1:dead:beef:cafe:fed7
(2620:52:3:1:dead:beef:cafe:fed7)) 56 data bytes
# ping -c 1 -4 fedoraproject.org
PING  (38.145.60.21) 56(84) bytes of data.

It seems some unwanted remains of no-aaaa option are present. A bit different
approach should be chosed to avoid that. But close enough.

Question is how tests should be modified. I am not very confident in
implementing that. This requires responses from dns, not sure how to fake them
properly.

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