Fix tox4 errors

Change-Id: I75c4c2d892ba4d8b2d96a6dc845e3091c821a774

tox.ini

@@ -1,6 +1,5 @@
 [tox]
 minversion = 3.18.0
-skipsdist = True
 envlist = py3,pep8
 # Automatic envs (pyXX) will only use the python version appropriate to that
 # env and ignore basepython inherited from [testenv] if we set
@@ -41,6 +40,10 @@ commands = reno new {posargs}
 commands = oslo_debug_helper {posargs}
 
 [testenv:pep8]
+allowlist_externals =
+  {toxinidir}/tools/check_exec.py
+  {toxinidir}/tools/check_logging.sh
+
 # Let's gate pep8 under py3 by default because the py3 checks are stricter.
 commands =
   flake8 {posargs}
@@ -110,6 +113,8 @@ usedevelop = False
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source manila --parallel-mode
+allowlist_externals = 
+  {toxinidir}/tools/cover.sh
 commands =
   {toxinidir}/tools/cover.sh {posargs}