Merge "Update min version of tox"

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist = py39,py38,py36,pep8,docs
-minversion = 3.1.1
+minversion = 3.18.0
 skipsdist = True
 ignore_basepython_conflict = True
 
@@ -18,9 +18,7 @@ setenv = VIRTUAL_ENV={envdir}
          TOX_CONSTRAINTS_FILE={toxinidir}/upper-constraints.txt
 passenv = TOX_CONSTRAINTS_FILE
 usedevelop = True
-whitelist_externals = rm
-install_command =
-    pip install -U {opts} {packages}
+allowlist_externals = rm
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -82,7 +80,7 @@ commands =
   flake8
   doc8 -e .rst doc/source/ CONTRIBUTING.rst HACKING.rst README.rst TESTING.rst
   tacker-db-manage check_migration
-whitelist_externals = bash
+allowlist_externals = bash
 
 [testenv:i18n]
 commands = python ./tools/check_i18n.py ./tacker
@@ -99,7 +97,7 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf api-ref/build
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
-whitelist_externals = rm
+allowlist_externals = rm
 
 [testenv:releasenotes]
 deps = -r{toxinidir}/doc/requirements.txt