Merge "Changed minversion in tox to 3.18.0"

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-minversion = 3.2.0
+minversion = 3.18.0
 envlist = py38,pep8
 skipsdist = True
 # Automatic envs (pyXX) will only use the python version appropriate to that
@@ -18,7 +18,7 @@ deps =
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 commands = stestr run {posargs}
-whitelist_externals = stestr
+allowlist_externals = stestr
 
 [testenv:fast8]
 # Use same environment directory as pep8 env to save space and install time
@@ -71,7 +71,7 @@ commands =
     pythom -m pip install -q -e "git+file://{toxinidir}/../openstacksdk#egg=openstacksdk"
     python -m pip freeze
     stestr run {posargs}
-whitelist_externals = stestr
+allowlist_externals = stestr
 
 [testenv:functional]
 setenv = OS_TEST_PATH=./openstackclient/tests/functional