Update tox ini file

Update tox to v4
Uplift promenade

Change-Id: I255e9dcf0ad9edc26069a1703fb5bf715cf67cf6

tox.ini

@@ -14,8 +14,15 @@ setenv =
 deps =
   pipenv
   setuptools < 58.0.0
-passenv = http_proxy https_proxy HTTP_PROXY HTTPS_PROXY no_proxy NO_PROXY PBR_VERSION
-whitelist_externals =
+passenv =
+  http_proxy
+  https_proxy
+  HTTP_PROXY
+  HTTPS_PROXY
+  no_proxy
+  NO_PROXY
+  PBR_VERSION
+allowlist_externals =
   bash
   find
 commands =
@@ -46,7 +53,7 @@ commands =
   bandit -r pegleg -n 5
   flake8 {toxinidir}/pegleg
   yapf -dr {toxinidir}/pegleg {toxinidir}/tests
-whitelist_externals =
+allowlist_externals =
   bash
 
 [testenv:docs]
@@ -58,7 +65,7 @@ deps =
 commands =
   pipenv install --dev
   bash -c "{toxinidir}/tools/gate/build-docs.sh"
-whitelist_externals =
+allowlist_externals =
   bash
 
 [testenv:bandit]
@@ -88,7 +95,7 @@ commands =
   bash -c 'PATH=$PATH:~/.local/bin; pytest --cov=pegleg --cov-report \
       html:cover --cov-report xml:cover/coverage.xml --cov-report term \
       --cov-fail-under 87 tests/'
-whitelist_externals =
+allowlist_externals =
   bash
 
 [testenv:update-requirements]
@@ -98,7 +105,7 @@ deps =
 commands =
   pipenv lock --clear
   bash -c "pipenv lock -r > {toxinidir}/requirements.txt"
-whitelist_externals =
+allowlist_externals =
   bash
 
 [testenv:releasenotes]
@@ -107,7 +114,7 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
-whitelist_externals =
+allowlist_externals =
   rm
 
 [testenv:venv]