Merge "fix tox python3 overrides"

tox.ini

@@ -11,6 +11,7 @@ setenv = VIRTUAL_ENV={envdir}
 whitelist_externals = bash
 
 [testenv:bindep]
+basepython = python3
 # Do not install any requirements. We want this to be fast and work even if
 # system dependencies are missing, since it's used to tell you what system
 # dependencies are missing! This also means that bindep must be installed
@@ -19,9 +20,11 @@ deps = bindep
 commands = bindep test
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:pep8]
+basepython = python3
 commands =
     # Run hacking/flake8 check for all python files
     bash -c "git ls-files | xargs grep --binary-files=without-match \
@@ -41,6 +44,7 @@ commands =
   bash ci-scripts/ansible-lint.sh
 
 [testenv:linters]
+basepython = python3
 deps =
     -r{toxinidir}/test-requirements.txt
     -r{toxinidir}/ansible-requirements.txt
@@ -49,6 +53,7 @@ commands =
     {[testenv:ansible-lint]commands}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]