Update tox.ini to work with python3.9 and tox 4

This change combines the following commits from `master`:

  commit 932ff63d6d
  Author: Al Bailey <al.bailey@windriver.com>
  Date:   Tue Dec 27 01:29:24 2022 +0000
    Update tox.ini to work with tox 4
  Signed-off-by: Al Bailey <al.bailey@windriver.com>

  commit 4d34b1ac65
  Author: Thiago Brito <thiago.brito@windriver.com>
  Date:   Wed Jun 22 12:27:57 2022 -0300
    Add flake8-import-order and use python3.9 on tox
  Signed-off-by: Thiago Brito <thiago.brito@windriver.com>

So that this repo is able to pass Zuul's tests and remain maintainable.

Signed-off-by: Luan Nunes Utimura <LuanNunes.Utimura@windriver.com>
Change-Id: Id3fc303e6febdbe434bb3e3b70d8e4e94cc098ed
(cherry picked from commit 932ff63d6d)
(cherry picked from commit 4d34b1ac65)

.zuul.yaml

@@ -5,16 +5,26 @@
       - stx-release-notes-jobs
     check:
       jobs:
-        - openstack-tox-pep8
-        - openstack-tox-linters
+        - stx-upstream-tox-pep8
+        - stx-upstream-tox-linters
     gate:
       jobs:
-        - openstack-tox-pep8
-        - openstack-tox-linters
+        - stx-upstream-tox-pep8
+        - stx-upstream-tox-linters
     post:
       jobs:
         - stx-upstream-upload-git-mirror
 
+- job:
+    name: stx-upstream-tox-pep8
+    parent: openstack-tox-pep8
+    nodeset: debian-bullseye
+
+- job:
+    name: stx-upstream-tox-linters
+    parent: openstack-tox-linters
+    nodeset: debian-bullseye
+
 - job:
     name: stx-upstream-upload-git-mirror
     parent: upload-git-mirror

openstack/python-horizon/centos/files/guni_config.py

@@ -3,6 +3,7 @@ import fnmatch
 import os
 import resource
 import subprocess
+
 from django.conf import settings
 
 

openstack/python-keystone/centos/files/public.py

@@ -12,10 +12,11 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import sys
 
 from keystone.server import wsgi as wsgi_server
 
-import sys
+
 sys.argv = sys.argv[:1]
 
 application = wsgi_server.initialize_public_application()

test-requirements.txt

@@ -1,4 +1,5 @@
-bashate >= 0.2
-PyYAML >= 3.1.0
-yamllint >= 0.5.2
-flake8 >= 2.5.4 # MIT
+bashate
+PyYAML
+yamllint
+flake8
+flake8-import-order

tox.ini

@@ -4,7 +4,12 @@ minversion = 2.3
 skipsdist = True
 
 [testenv]
-install_command = pip install -U {opts} {packages}
+basepython = python3.9
+install_command = pip install \
+    -v -v -v \
+    -U \
+    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/starlingx/root/raw/branch/master/build-tools/requirements/debian/upper-constraints.txt} \
+    {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          OS_STDOUT_CAPTURE=1
          OS_STDERR_CAPTURE=1
@@ -12,8 +17,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:linters]
-basepython = python3
-whitelist_externals = bash
+allowlist_externals = bash
 commands =
   bash -c "find {toxinidir}          \
          -not \( -type d -name .?\* -prune \) \
@@ -27,17 +31,6 @@ commands =
             -o -name '*.yaml'       \
             -print0 | xargs -0 yamllint"
 
-[testenv:pep8]
-basepython = python3
-usedevelop = False
-description =
-    Run style checks.
-
-
-commands =
-    flake8
-
-
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 # E501 skipped because some of the code files include templates
@@ -46,10 +39,20 @@ commands =
 show-source = True
 ignore = E123,E125,E501,H405
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,release-tag-*
+import-order-style = google
+
+
+[testenv:pep8]
+usedevelop = False
+description =
+          Run style checks.
+
+
+commands =
+          flake8
 
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:docs]
@@ -58,7 +61,7 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands =
     rm -rf doc/build
     sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
-whitelist_externals = rm
+allowlist_externals = rm
 
 [testenv:releasenotes]
 basepython = python3
@@ -66,13 +69,13 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands =
     rm -rf releasenotes/build
     sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
-whitelist_externals =
+allowlist_externals =
     rm
     reno
 
 [testenv:newnote]
-basepython = python3
 # Re-use the releasenotes venv
+basepython = python3
 envdir = {toxworkdir}/releasenotes
 deps = -r{toxinidir}/doc/requirements.txt
 commands = reno new {posargs}