Increase timeout in the rndc deadlock test

The timeout originally picked for "rndc status" invocations (2 seconds)
in the test attempting to reproduce a deadlock caused by running
multiple "rndc addzone", "rndc modzone", and "rndc delzone" commands
concurrently causes intermittent failures of the "addzone" system test
in GitLab CI.  Increase the timeout to 10 seconds to make such failures
less probable.  Adjust code comments accordingly.
75 jobs for !5163 with 2763-increase-timeout-in-the-rndc-deadlock-test in 27 minutes and 32 seconds (queued for 13 seconds)
detached
Status Job ID Name Coverage
  Autoconf
passed #1785947
amd64 linux
autoreconf

00:00:20

 
  Precheck
passed #1785949
amd64 linux
clang-format

00:00:19

passed #1785950
amd64 linux
coccinelle

00:04:32

passed #1805745
amd64 linux
danger

00:00:13

passed #1785948
amd64 linux
misc

00:00:16

passed #1785952
amd64 linux
tarball-create

00:01:32

passed #1785951
amd64 linux
danger

00:00:16

 
  Build
passed #1785965
amd64 linux
clang:asan

00:01:57

passed #1785969
amd64 linux
clang:buster:amd64

00:00:51

passed #1785972
amd64 libvirt
clang:freebsd12:amd64

00:01:10

passed #1785973
amd64 libvirt
clang:freebsd13:amd64

00:03:00

passed #1785974
amd64 libvirt
clang:openbsd:amd64

00:02:16

passed #1785967
amd64 linux
clang:tsan

00:01:16

passed #1785953
amd64 linux
gcc:alpine3.13:amd64

00:00:55

passed #1785964
amd64 linux
gcc:asan

00:01:43

passed #1785962
amd64 linux
gcc:bionic:amd64

00:01:05

passed #1785957
amd64 linux
gcc:buster:amd64

00:00:45

passed #1785954
amd64 linux
gcc:centos7:amd64

00:00:52

passed #1785955
amd64 linux
gcc:centos8:amd64

00:00:48

passed #1785963
amd64 linux
gcc:focal:amd64

00:00:49

passed #1785968
amd64 linux
gcc:mutexatomics

00:00:49

passed #1785959
amd64 linux
gcc:out-of-tree

00:00:56

passed #1785958
amd64 linux
gcc:sid:amd64

00:01:03

passed #1785970
amd64 linux
gcc:softhsm2.4

00:00:58

passed #1785971
amd64 linux
gcc:softhsm2.6

00:00:58

passed #1785956
amd64 linux
gcc:stretch:amd64

00:01:04

passed #1785960
amd64 linux
gcc:tarball

00:01:01

passed #1785966
amd64 linux
gcc:tsan

00:01:00

passed #1785961
amd64 linux
gcc:tumbleweed:amd64

00:00:51

 
  Unit
passed #1785985
amd64 linux
unit:clang:asan

00:02:09

passed #1785989
amd64 linux
unit:clang:buster:amd64

00:01:20

passed #1785992
amd64 libvirt
unit:clang:freebsd12:amd64

00:01:43

passed #1785993
amd64 libvirt
unit:clang:freebsd13:amd64

00:03:32

passed #1785994
amd64 libvirt
unit:clang:openbsd:amd64

00:03:16

passed #1785987
amd64 linux
unit:clang:tsan

00:03:41

passed #1785975
amd64 linux
unit:gcc:alpine3.13:amd64

00:01:33

passed #1785984
amd64 linux
unit:gcc:asan

00:01:52

passed #1785982
amd64 linux
unit:gcc:bionic:amd64

00:01:21

passed #1785979
amd64 linux
unit:gcc:buster:amd64

00:02:25

passed #1785976
amd64 linux
unit:gcc:centos7:amd64

00:01:30

passed #1785977
amd64 linux
unit:gcc:centos8:amd64

00:01:16

passed #1785983
amd64 linux
unit:gcc:focal:amd64

00:01:19

passed #1785988
amd64 linux
unit:gcc:mutexatomics

00:01:27

passed #1785980
amd64 linux
unit:gcc:sid:amd64

00:01:18

passed #1785990
amd64 linux
unit:gcc:softhsm2.4

00:01:21

passed #1785991
amd64 linux
unit:gcc:softhsm2.6

00:01:14

passed #1785978
amd64 linux
unit:gcc:stretch:amd64

00:00:16

passed #1785986
amd64 linux
unit:gcc:tsan

00:04:42

passed #1785981
amd64 linux
unit:gcc:tumbleweed:amd64

00:01:20

 
  System
passed #1786005
amd64 linux
system:clang:asan

00:14:52

passed #1786009
amd64 linux
system:clang:buster:amd64

00:11:47

passed #1786239
libvirt amd64
system:clang:freebsd12:amd64

00:11:44

passed #1786013
amd64 libvirt
system:clang:freebsd13:amd64

00:13:49

passed #1786007
amd64 linux
system:clang:tsan

00:17:23

passed #1785995
amd64 linux
system:gcc:alpine3.13:amd64

00:12:41

passed #1786004
amd64 linux
system:gcc:asan

00:15:04

passed #1786002
amd64 linux
system:gcc:bionic:amd64

00:12:56

passed #1785999
amd64 linux
system:gcc:buster:amd64

00:13:50

passed #1785996
amd64 linux
system:gcc:centos7:amd64

00:13:42

passed #1785997
amd64 linux
system:gcc:centos8:amd64

00:11:58

passed #1786003
amd64 linux
system:gcc:focal:amd64

00:13:06

passed #1786008
amd64 linux
system:gcc:mutexatomics

00:12:47

passed #1786000
amd64 linux
system:gcc:sid:amd64

00:12:58

passed #1786010
amd64 linux
system:gcc:softhsm2.4

00:13:10

passed #1786011
amd64 linux
system:gcc:softhsm2.6

00:12:53

passed #1785998
amd64 linux
system:gcc:stretch:amd64

00:11:49

passed #1786006
amd64 linux
system:gcc:tsan

00:16:51

passed #1786001
amd64 linux
system:gcc:tumbleweed:amd64

00:13:47

failed #1786012
amd64 libvirt
system:clang:freebsd12:amd64

00:11:47

 
  Docs
passed #1786014
amd64 linux
docs

00:00:48

 
  Postcheck
passed #1786018
amd64 linux
cppcheck

00:00:47

passed #1786015
amd64 linux
flake8

00:00:19

passed #1786019
amd64 linux
gcov

00:00:35

78.0%
passed #1786016
amd64 linux
pylint

00:00:24

passed #1786017
amd64 linux
scan-build

00:04:11