tox - fix allowlist_external issues

Change-Id: I07d2126176d00acf361349fa6f8de6b34ae64a16

tox.ini

@@ -5,7 +5,7 @@ ignore_basepython_conflict = true
 
 [testenv]
 basepython = python3
-whitelist_externals =
+allowlist_externals =
   find
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
@@ -25,7 +25,7 @@ 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
@@ -34,7 +34,7 @@ commands =
   sphinx-build -a -E -W --keep-going -b html doc/source doc/build/html
 
 [testenv:releasenotes]
-whitelist_externals = rm
+allowlist_externals = rm
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt