To see if this fix the markup gitlab

In cases where the DNS server does not respond “domain not found” but
“domain found, but no IP for that record type”, we just say “domain not
found” too (instead of nothing, previously).

fix #3382

It still needs to be fixed properly by cleaning the way we send the messages
in all direction etc. And this is ugly because, with just one message, we do
a conversion in one direction, and then re-convert in the other
direction. But at least it works and users will be happy, even if I’m not
entirely satisfied with the code.

XEP-0410 demands that. This changes the error condition for all
pings to the room, even those which aren’t self-pings, if the
sender is not joined.

The conditions of XEP-0410 were based on observing existing
implementations.

This prevents the ping from round-tripping through IRC and
possibly a random other client of the user. Please see XEP-0410
for the rationale.

Fixes #3385.

Jonas Schäfer authored Oct 02, 2018 and louiz’ committed Oct 04, 2018

Fixes #3381

For “security” reason, the freebsd runner is not accessible for anyone else,
so it just yields an error when it tries to run. With this change, it is
just not run.

fix #3377

fix #3378