Add py.test-3 to the list of tested pytest names

Some operating systems (e.g. CentOS, OpenBSD) install the main pytest
script as "py.test-3".  Add that name to the list of names passed to
AC_PATH_PROGS() in order for pytest to be properly detected on a broader
range of operating systems.

(cherry picked from commit d5562a3e)
81 jobs for !3573 with michal/do-not-install-python-packages-in-gitlab-ci-jobs-v9_16 in 23 minutes and 28 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #898104
amd64 linux
autoreconf

00:01:10

passed #898106
amd64 linux
clang-format

00:01:13

passed #898107
amd64 linux
coccinelle

00:05:59

passed #898105
amd64 linux
misc

00:01:11

 
  Build
passed #898123
amd64 linux
clang:asan

00:06:33

passed #898127
amd64 linux
clang:buster:amd64

00:04:26

passed #898129
amd64 libvirt
clang:freebsd11.3:amd64

00:03:29

passed #898130
amd64 libvirt
clang:freebsd12.1:amd64

00:02:38

passed #898131
amd64 libvirt
clang:openbsd6.6:amd64

00:06:58

passed #898125
amd64 linux
clang:tsan

00:05:22

passed #898108
amd64 linux
gcc:alpine3.11:amd64

00:02:59

passed #898122
amd64 linux
gcc:asan

00:05:23

passed #898121
amd64 linux
gcc:bionic:amd64

00:02:57

passed #898113
amd64 linux
gcc:buster:amd64

00:03:51

passed #898109
amd64 linux
gcc:centos6:amd64

00:04:06

passed #898110
amd64 linux
gcc:centos7:amd64

00:04:00

passed #898111
amd64 linux
gcc:centos8:amd64

00:05:57

passed #898119
amd64 linux
gcc:fedora31:amd64

00:04:10

passed #898126
amd64 linux
gcc:mutexatomics

00:03:35

passed #898115
amd64 linux
gcc:out-of-tree

00:04:19

passed #898128
amd64 linux
gcc:pkcs11

00:03:24

passed #898114
amd64 linux
gcc:sid:amd64

00:06:36

passed #898116
arm64 linux
gcc:sid:arm64

00:09:10

passed #898117
i386 linux
gcc:sid:i386

00:03:56

passed #898112
amd64 linux
gcc:stretch:amd64

00:05:53

passed #898124
amd64 linux
gcc:tsan

00:05:10

passed #898118
amd64 linux
gcc:tumbleweed:amd64

00:05:56

passed #898120
amd64 linux
gcc:xenial:amd64

00:05:12

passed #898133
amd64 windows
msvc:windows:amd64

00:02:35

passed #898132
amd64 linux
nolibtool:sid:amd64

00:05:19

 
  Unit
canceled #898148
amd64 linux
unit:clang:asan

canceled #898152
amd64 linux
unit:clang:buster:amd64

passed #898154
amd64 libvirt
unit:clang:freebsd11.3:amd64

00:01:36

passed #898155
amd64 libvirt
unit:clang:freebsd12.1:amd64

00:01:18

canceled #898150
amd64 linux allowed to fail
unit:clang:tsan

canceled #898134
amd64 linux
unit:gcc:alpine3.11:amd64

00:01:19

canceled #898147
amd64 linux
unit:gcc:asan

canceled #898146
amd64 linux
unit:gcc:bionic:amd64

canceled #898139
amd64 linux
unit:gcc:buster:amd64

canceled #898135
amd64 linux
unit:gcc:centos6:amd64

00:01:18

canceled #898136
amd64 linux
unit:gcc:centos7:amd64

00:00:42

canceled #898137
amd64 linux
unit:gcc:centos8:amd64

canceled #898144
amd64 linux
unit:gcc:fedora31:amd64

canceled #898151
amd64 linux
unit:gcc:mutexatomics

canceled #898153
amd64 linux
unit:gcc:pkcs11

canceled #898140
amd64 linux
unit:gcc:sid:amd64

canceled #898141
arm64 linux
unit:gcc:sid:arm64

canceled #898142
i386 linux
unit:gcc:sid:i386

canceled #898138
amd64 linux
unit:gcc:stretch:amd64

canceled #898149
amd64 linux allowed to fail
unit:gcc:tsan

canceled #898143
amd64 linux
unit:gcc:tumbleweed:amd64

canceled #898145
amd64 linux
unit:gcc:xenial:amd64

canceled #898156
amd64 linux
unit:nolibtool:sid:amd64

 
  System
canceled #898171
amd64 linux
system:clang:asan

canceled #898175
amd64 linux
system:clang:buster:amd64

canceled #898177
amd64 libvirt
system:clang:freebsd11.3:amd64

00:02:43

passed #898178
amd64 libvirt
system:clang:freebsd12.1:amd64

00:13:24

canceled #898173
amd64 linux allowed to fail
system:clang:tsan

passed #898157
amd64 linux
system:gcc:alpine3.11:amd64

00:14:09

canceled #898170
amd64 linux
system:gcc:asan

canceled #898169
amd64 linux
system:gcc:bionic:amd64

canceled #898162
amd64 linux
system:gcc:buster:amd64

canceled #898158
amd64 linux
system:gcc:centos6:amd64

canceled #898159
amd64 linux
system:gcc:centos7:amd64

canceled #898160
amd64 linux
system:gcc:centos8:amd64

canceled #898167
amd64 linux
system:gcc:fedora31:amd64

canceled #898174
amd64 linux
system:gcc:mutexatomics

canceled #898176
amd64 linux
system:gcc:pkcs11

canceled #898163
amd64 linux
system:gcc:sid:amd64

canceled #898164
arm64 linux
system:gcc:sid:arm64

canceled #898165
i386 linux
system:gcc:sid:i386

canceled #898161
amd64 linux
system:gcc:stretch:amd64

canceled #898172
amd64 linux allowed to fail
system:gcc:tsan

canceled #898166
amd64 linux
system:gcc:tumbleweed:amd64

canceled #898168
amd64 linux
system:gcc:xenial:amd64

canceled #898179
amd64 linux
system:nolibtool:sid:amd64

 
  Docs
passed #898180
amd64 linux
docs

00:01:28

 
  Postcheck
passed #898184
amd64 linux
cppcheck

00:01:33

passed #898181
amd64 linux
flake8

00:01:56

passed #898182
amd64 linux
pylint

00:01:14

canceled #898183
amd64 linux
scan-build

00:03:31