Do not install Python packages in GitLab CI jobs

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)
81 jobs for !3574 with michal/do-not-install-python-packages-in-gitlab-ci-jobs-v9_11 in 3 minutes and 24 seconds (queued for 7 seconds)
latest detached
Status Job ID Name Coverage
  Precheck
passed #898185
amd64 linux
autoreconf

00:01:03

canceled #898187
amd64 linux
clang-format

canceled #898188
amd64 linux
coccinelle

canceled #898186
amd64 linux
misc

 
  Build
canceled #898204
amd64 linux
clang:asan

canceled #898208
amd64 linux
clang:buster:amd64

canceled #898210
amd64 libvirt
clang:freebsd11.3:amd64

canceled #898211
amd64 libvirt
clang:freebsd12.1:amd64

canceled #898212
amd64 libvirt
clang:openbsd6.6:amd64

canceled #898206
amd64 linux
clang:tsan

canceled #898189
amd64 linux
gcc:alpine3.11:amd64

canceled #898203
amd64 linux
gcc:asan

canceled #898202
amd64 linux
gcc:bionic:amd64

canceled #898194
amd64 linux
gcc:buster:amd64

canceled #898190
amd64 linux
gcc:centos6:amd64

canceled #898191
amd64 linux
gcc:centos7:amd64

canceled #898192
amd64 linux
gcc:centos8:amd64

canceled #898200
amd64 linux
gcc:fedora31:amd64

canceled #898207
amd64 linux
gcc:mutexatomics

canceled #898196
amd64 linux
gcc:out-of-tree

canceled #898209
amd64 linux
gcc:pkcs11

canceled #898195
amd64 linux
gcc:sid:amd64

canceled #898197
arm64 linux
gcc:sid:arm64

canceled #898198
i386 linux
gcc:sid:i386

canceled #898193
amd64 linux
gcc:stretch:amd64

canceled #898205
amd64 linux
gcc:tsan

canceled #898199
amd64 linux
gcc:tumbleweed:amd64

canceled #898201
amd64 linux
gcc:xenial:amd64

canceled #898214
amd64 windows
msvc:windows:amd64

00:00:54

canceled #898213
amd64 linux
nolibtool:sid:amd64

 
  Unit
skipped #898229
amd64 linux
unit:clang:asan
skipped #898233
amd64 linux
unit:clang:buster:amd64
skipped #898235
amd64 libvirt
unit:clang:freebsd11.3:amd64
skipped #898236
amd64 libvirt
unit:clang:freebsd12.1:amd64
skipped #898231
amd64 linux allowed to fail
unit:clang:tsan
skipped #898215
amd64 linux
unit:gcc:alpine3.11:amd64
skipped #898228
amd64 linux
unit:gcc:asan
skipped #898227
amd64 linux
unit:gcc:bionic:amd64
skipped #898220
amd64 linux
unit:gcc:buster:amd64
skipped #898216
amd64 linux
unit:gcc:centos6:amd64
skipped #898217
amd64 linux
unit:gcc:centos7:amd64
skipped #898218
amd64 linux
unit:gcc:centos8:amd64
skipped #898225
amd64 linux
unit:gcc:fedora31:amd64
skipped #898232
amd64 linux
unit:gcc:mutexatomics
skipped #898234
amd64 linux
unit:gcc:pkcs11
skipped #898221
amd64 linux
unit:gcc:sid:amd64
skipped #898222
arm64 linux
unit:gcc:sid:arm64
skipped #898223
i386 linux
unit:gcc:sid:i386
skipped #898219
amd64 linux
unit:gcc:stretch:amd64
skipped #898230
amd64 linux allowed to fail
unit:gcc:tsan
skipped #898224
amd64 linux
unit:gcc:tumbleweed:amd64
skipped #898226
amd64 linux
unit:gcc:xenial:amd64
skipped #898237
amd64 linux
unit:nolibtool:sid:amd64
 
  System
skipped #898252
amd64 linux
system:clang:asan
skipped #898256
amd64 linux
system:clang:buster:amd64
skipped #898258
amd64 libvirt
system:clang:freebsd11.3:amd64
skipped #898259
amd64 libvirt
system:clang:freebsd12.1:amd64
skipped #898254
amd64 linux allowed to fail
system:clang:tsan
skipped #898238
amd64 linux
system:gcc:alpine3.11:amd64
skipped #898251
amd64 linux
system:gcc:asan
skipped #898250
amd64 linux
system:gcc:bionic:amd64
skipped #898243
amd64 linux
system:gcc:buster:amd64
skipped #898239
amd64 linux
system:gcc:centos6:amd64
skipped #898240
amd64 linux
system:gcc:centos7:amd64
skipped #898241
amd64 linux
system:gcc:centos8:amd64
skipped #898248
amd64 linux
system:gcc:fedora31:amd64
skipped #898255
amd64 linux
system:gcc:mutexatomics
skipped #898257
amd64 linux
system:gcc:pkcs11
skipped #898244
amd64 linux
system:gcc:sid:amd64
skipped #898245
arm64 linux
system:gcc:sid:arm64
skipped #898246
i386 linux
system:gcc:sid:i386
skipped #898242
amd64 linux
system:gcc:stretch:amd64
skipped #898253
amd64 linux allowed to fail
system:gcc:tsan
skipped #898247
amd64 linux
system:gcc:tumbleweed:amd64
skipped #898249
amd64 linux
system:gcc:xenial:amd64
skipped #898260
amd64 linux
system:nolibtool:sid:amd64
 
  Docs
canceled #898261
amd64 linux
docs

 
  Postcheck
canceled #898265
amd64 linux
cppcheck

passed #898262
amd64 linux
flake8

00:01:18

passed #898263
amd64 linux
pylint

00:01:24

canceled #898264
amd64 linux
scan-build