Fix issues related to tox4

Change-Id: I7be9a22796f484df79f0f509a2cf4f47e3a00128

tox.ini

@@ -1,12 +1,9 @@
 [tox]
 minversion = 3.2.0
-distribute = False
 envlist = py3,pep8
-ignore_basepython_conflict = true
 
 [testenv]
-basepython = python3
-whitelist_externals =
+allowlist_externals =
   find
 setenv =
   OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:1}
@@ -43,7 +40,7 @@ commands =
 commands = {posargs}
 
 [testenv:docs]
-whitelist_externals = rm
+allowlist_externals = rm
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
@@ -60,7 +57,7 @@ commands =
   bandit -r oslo_config -x tests -n5
 
 [testenv:releasenotes]
-whitelist_externals =
+allowlist_externals =
   rm
 deps = {[testenv:docs]deps}
 commands =