Update tox.ini to work with tox 4

This change will allow this repo to pass zuul now
that this has merged:
https://review.opendev.org/c/zuul/zuul-jobs/+/866943

Tox 4 deprecated whitelist_externals.
Replace whitelist_externals with allowlist_externals

Removed the py27 zuul job target.

Updated the base tox.ini so that the showconfig
will pass for the pep8 target in the tox.ini in the subdir.

Partial-Bug: #2000399

Signed-off-by: Al Bailey <al.bailey@windriver.com>
Change-Id: I4227eae6dc9e796f784984d31f575297ae0f2838

.zuul.yaml

@@ -3,7 +3,6 @@
     check:
       jobs:
         - openstack-tox-linters
-        - k8sapp-openstack-tox-py27
         - k8sapp-openstack-tox-py36
         - k8sapp-openstack-tox-py39
         - k8sapp-openstack-tox-pylint
@@ -11,7 +10,6 @@
     gate:
       jobs:
         - openstack-tox-linters
-        - k8sapp-openstack-tox-py27
         - k8sapp-openstack-tox-py36
         - k8sapp-openstack-tox-py39
         - k8sapp-openstack-tox-pylint
@@ -19,23 +17,6 @@
       jobs:
         - stx-openstack-armada-app-upload-git-mirror
 
-- job:
-    name: k8sapp-openstack-tox-py27
-    parent: tox-py27
-    description: |
-        Run py27 test for k8app-openstack
-    nodeset: debian-bullseye
-    required-projects:
-      - starlingx/config
-      - starlingx/fault
-      - starlingx/update
-      - starlingx/utilities
-    files:
-        - python-k8sapp-openstack/k8sapp_openstack/*
-    vars:
-        tox_envlist: py27
-        python_version: 2.7
-        tox_extra_args: -c python-k8sapp-openstack/k8sapp_openstack/tox.ini
 - job:
     name: k8sapp-openstack-tox-py36
     parent: tox-py36

python-k8sapp-openstack/k8sapp_openstack/tox.ini

@@ -19,7 +19,7 @@ basepython = python3.9
 sitepackages = False
 
 # tox is silly... these need to be separated by a newline....
-whitelist_externals = bash
+allowlist_externals = bash
                       find
 
 install_command = pip install -v -v -v \

tox.ini

@@ -15,7 +15,7 @@ setenv =
 deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
-whitelist_externals =
+allowlist_externals =
   bash
 
 [testenv:bashate]
@@ -32,6 +32,10 @@ commands =
 commands =
     {[testenv:bashate]commands}
 
+[testenv:pep8]
+basepython = python3
+description = Dummy environment to allow pep8 to be run in subdir tox
+
 [testenv:pylint]
 basepython = python3
 description = Dummy environment to allow pylint to run in subdir tox