Add +yaml support for EDE

See merge request !3667

(cherry picked from commit 0ec77c2b)

Resolve "system test fails on single stack system"

See merge request !3586

Delay kserver cleanup until all tasks finish (v9.11)

See merge request !3652

(cherry picked from commit 72e78f0a)

It might be possible some pending task would run when kserver is already
cleaned up. Postpone gsstsig structures cleanup after task and timer
managers are destroyed. No pending threads are possible after it.

Make action in maybeshutdown only if doshutdown was not already called.
Might be called from getinput event.

(cherry picked from commit 2685e69b)

Resolve "CIDR rejected by 9.11.18 and higher"

See merge request !3639

In [RT #43367], the BIND 9 changed the strictness of address / prefix
length checks:

    Check prefixes in acls to make sure the address and
    prefix lengths are consistent.  Warn only in
    BIND 9.11 and earlier.

Unfortunately, a regression slipped in and the check was made an error
also in the BIND 9.11.  This commit fixes the regression, but turning
the error into a warning.

[v9_11] Miscellaneous Danger tweaks

See merge request !3641

Prevent the Danger GitLab CI job from failing when the GitLab API key to
use is not set.

(cherry picked from commit 2c904385)

The Danger script inspects differences between the current version of a
given merge request's target branch and the merge request branch.  If
the latter falls behind the former, the Danger script will wrongly warn
about missing GitLab/RT identifiers because it incorrectly treats the
"+++" diff marker as an indication of the merge request adding new lines
to a file.  Tweak the relevant conditional expression to prevent such
invalid warnings from being raised.

(cherry picked from commit e062812c)

As GitLab Runner Docker executor caches Git repositories between jobs,
prevent the Danger script from attempting to update local refs to ensure
"git fetch" returns with an exit code of 0.  Use the FETCH_HEAD ref for
determining the differences between the merge request branch and its
target branch.

(cherry picked from commit d558c4cb)

Commits adding CHANGES entries and/or release notes do not need a commit
log message.  Do not warn about a missing commit log message for such
commits to make the warning more meaningful.

(cherry picked from commit c13944ca)

tests: fix isc/socket_test.c teardown

See merge request !3637

In case of a test failure we weren't tearing down sockets and tasks
properly, causing the test to hang instead of failing nicely.

(cherry picked from commit 4a8d9250)

fix CI configure for v9_11

See merge request !3617

remove --disable-maintainer-mode
rename --with-json to --with-libjson

Add Danger Python to GitLab CI (v9.11)

See merge request !3612

Certain rules of the BIND development process are not codified anywhere
and/or are used inconsistently.  In an attempt to improve this
situation, add a GitLab CI job which uses Danger Python to add comments
to merge requests when certain expectations are not met.  Two categories
of feedback are used, only one of which - fail() - causes the GitLab CI
job to fail.  Exclude dangerfile.py from Python QA checks as the way the
contents of that file are evaluated triggers a lot of Flake8 and PyLint
warnings.

(cherry picked from commit 36bb45a8)

Lock access to 'answer' to silence TSAN

See merge request !3598

(cherry picked from commit b3bd8a27)

Resolve "Force promotion to unsigned int."

See merge request !3547

Resolve "named_checknames_get missing DBC"

See merge request !3582

(cherry picked from commit 20c07da4)

(cherry picked from commit ac9e2667)

[v9_11] Do not install Python packages in GitLab CI jobs

See merge request !3574

As Python QA tools, BIND system test prerequisites, and documentation
building utilities are now all included in operating system images used
in GitLab CI, do not use pip for installing them in each CI job any
more.

(cherry picked from commit e3c21729)

[CVE-2020-8616] [CVE-2020-8617] Merge 9.11.19 release branch

See merge request !3565

1388 confidential issue security v9 11

See merge request isc-private/bind9!153

1703 tsig verify failure security v9 11

See merge request isc-private/bind9!150