Merge "fix tox python3 overrides"

tox.ini

@@ -4,7 +4,6 @@ minversion = 2.3
 skipsdist = True
 
 [testenv]
-basepython = python3
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          OS_STDOUT_CAPTURE=1
@@ -13,6 +12,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:linters]
+basepython = python3
 whitelist_externals = bash
 commands =
   bash -c "find {toxinidir}          \
@@ -33,6 +33,7 @@ commands =
 ####
 # Add flake8 as pep8 codestyle check.
 [testenv:pep8]
+basepython = python3
 description =
   Run style checks.
 commands =
@@ -47,6 +48,7 @@ ignore = E123,E125,E501,H405
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,release-tag-*
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:docs]
@@ -68,6 +70,7 @@ whitelist_externals =
     reno
 
 [testenv:newnote]
+basepython = python3
 # Re-use the releasenotes venv
 envdir = {toxworkdir}/releasenotes
 deps = -r{toxinidir}/doc/requirements.txt