Explicitly use python2.7 for linters and basic jobs

Queens is the last version before the introduction of the new PTI
which switched the basic jobs to python3.
Despite being EM, the pep8 job is failing because it tries to use
python3 (now the default on the OpenDev-provided Zuul instances)
but it is still worth fixing it.

Change-Id: Ifa03268f3e062ee8e3b4453b48163cd5e504451d

1 files changed, 3 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index c44af70..a5c1576 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,9 +24,11 @@ commands = find . -type f -name "*.pyc" -delete
 whitelist_externals = find
 
 [testenv:pep8]
+basepython = python2.7
 commands = flake8
 
 [testenv:pylint]
+basepython = python2.7
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/queens}
   -r{toxinidir}/requirements.txt
@@ -62,6 +64,7 @@ deps =
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:functional]
+basepython = python2.7
 commands = ostestr {posargs}
 setenv =
   {[testenv]setenv}