Comment 5 for bug 1802032

Reviewed: https://review.openstack.org/608227
Committed: https://git.openstack.org/cgit/openstack/stx-specs/commit/?id=5ea99870e391eafd77a80db6cd744eb75314fa36
Submitter: Zuul
Branch: master

commit 5ea99870e391eafd77a80db6cd744eb75314fa36
Author: 98k <18552437190@163.com>
Date: Fri Oct 5 10:59:20 2018 +0000

    fix tox python3 overrides

    We want to default to running all tox environments under python 3, so
    set the basepython value in each environment.

    We do not want to specify a minor version number, because we do not
    want to have to update the file every time we upgrade python.

    We do not want to set the override once in testenv, because that
    breaks the more specific versions used in default environments like
    py35 and py36.

    Change-Id: I360cea415303e794c6cbacc26e91f4c8735373fb
    Partial-Bug: #1802032
    Signed-off-by: Andriy Shevchenko <18552437190@163.com>