Fix issues with tox 4.2.4

tox now hard fails if there is mismatch in spec
attributes[1]. This works around the issue
temporarily. We probably have to drop py38 jobs
and specify basepython for py39 target in the
future.

Removes ansible-galaxy --timeout for py* jobs to
workaround. We may hit the timeout with py* jobs.

[1] https://github.com/tox-dev/tox/pull/2824/

Closes-Bug: #2001602
Closes-Bug: #2002035
Change-Id: Iad2455193885205236e03c1219352102bb931de8

tox.ini

@@ -1,8 +1,10 @@
 [tox]
 minversion = 3.18.0
 envlist = docs,linters
+ignore_base_python_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 passenv = *
 setenv =
@@ -33,7 +35,9 @@ deps =
    -r {toxinidir}/test-requirements.txt
    -r {toxinidir}/ansible-requirements.txt
 commands =
-   ansible-galaxy install --timeout 600 -fr {toxinidir}/tripleo_ansible/ansible-collections-requirements.yml
+# ansible-core 2.13.6 installed with py38 does not provide a way to set
+# timeout with ansible-galaxy command.
+   ansible-galaxy install -fr {toxinidir}/tripleo_ansible/ansible-collections-requirements.yml
    stestr run {posargs}
 allowlist_externals =
    bash
@@ -41,13 +45,6 @@ allowlist_externals =
    true
    ansible-galaxy
 
-[testenv:py38]
-# ansible-core 2.3.16 installed with py38 does not provide a way to set
-# timeout with ansible-galaxy command.
-commands =
-   ansible-galaxy install -fr {toxinidir}/tripleo_ansible/ansible-collections-requirements.yml
-   stestr run {posargs}
-
 [testenv:bindep]
 # Do not install any requirements. We want this to be fast and work even if
 # system dependencies are missing, since it's used to tell you what system
@@ -70,7 +67,6 @@ commands =
    python -m pre_commit run -a
 
 [testenv:releasenotes]
-basepython = python3
 deps =
    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
    -r {toxinidir}/doc/requirements.txt
@@ -78,7 +74,6 @@ commands =
    sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
 [testenv:docs]
-basepython = python3
 deps =
    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
    -r {toxinidir}/doc/requirements.txt
@@ -105,7 +100,6 @@ skip_install = True
 sitepackages = False
 
 [testenv:role-addition]
-basepython = python3
 deps =
    pre-commit
    virtualenv