Refusing to answer queries without RD bit makes it harder
to read what data is present in resolver's cache.

avoid a false-positive assert from rebinding module

See merge request !851

Somehow I didn't notice this field when adding ::add_selected.
We probably never put anything into answer's ADDITIONAL,
so noone's noticed a problem until now.

We currently allow modules to produce a packet beforehand,
but the possibility was rather implicit in this part of code.
In particular, we might possible trigger a false alarm in
assert(answer->current <= KNOT_ANSWER)

ci: respdiff - extract multiple archives

See merge request !853

Closes #489

Tomas Krizek authored 5 years ago and Vladimír Čunát committed 5 years ago

The code incorrectly assumes GNUTLS_E_AGAIN can only be caused
by reading the entire libuv buffer. Legitime causes of GNUTLS_E_AGAIN
wouldn't be processed correctly. These could be caused by a new
session ticket sent by the server.

Fixes #489

modules: fix typo in link to upgrading guide

See merge request !852

ci: add distrotest:debian10

See merge request !848

ci: update

See merge request !847

use sendmmsg syscall towards UDP clients

See merge request !846

Release 4.1.0

See merge request !845

Main motivation is getting rid of tab-space mix.
Reformated using github/torvalds/linux/master/scripts/Lindent.