Fix tox4 error

tox.ini started failing with Tox4 which had some
incompatible changes. One of them is changing
whitelist to allowlist. Other failure is due to
the skipsdist = True.

Also, remove basepython definition from tox.ini. Tox 4.2.6
failing as testenv:functional{,-py38,-py39,-py310}] format
is leads to missing interpreter error.

Change-Id: I49523d1e35c85ab34f17c85e873bbe3744629c64

tox.ini

@@ -1,10 +1,8 @@
 [tox]
 envlist = pep8,eslint,karma-local,docs-local,releasenotes,lower-constraints-local
 minversion = 2.3.2
-skipsdist = True
 
 [testenv]
-basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          NOSE_WITH_OPENSTACK=1
@@ -55,7 +53,7 @@ commands =
   {[testenv]commands}
 
 [testenv:eslint]
-whitelist_externals =
+Allowlist_externals =
   npm
 commands =
   npm install
@@ -65,14 +63,14 @@ commands =
 # from master branch into python3.x environment for testing javascripts.
 # Horizon from master is needed to be cloned into ../horizon on both local and CI.
 [testenv:karma]
-whitelist_externals =
+Allowlist_externals =
   {[testenv:eslint]whitelist_externals}
 commands =
   npm install
   npm run test
 
 [testenv:karma-local]
-whitelist_externals =
+Allowlist_externals =
   {[testenv:eslint]whitelist_externals}
 commands =
   {[testenv:karma]commands}