Comment 7 for bug 1802032

Reviewed: https://review.opendev.org/608214
Committed: https://git.openstack.org/cgit/starlingx/docs/commit/?id=857d9b1ff16b819370f53b8e4b42f1a05a18ff8e
Submitter: Zuul
Branch: master

commit 857d9b1ff16b819370f53b8e4b42f1a05a18ff8e
Author: 98k <18552437190@163.com>
Date: Fri Oct 5 10:37:36 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: I4dae808f500bd5c8caa462a2d1deae157adff29d
    Closes-Bug: #1802032