tree 3321f13c44b6d06a98f06a5db72808878bc6cb79
parent 57be518b726827646c35d86e3cf4bf43526d10ea
author huang.zhiping <huang.zhiping@99cloud.net> 1528541550 +0800
committer huang.zhiping <huang.zhiping@99cloud.net> 1528541640 +0800

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: I883f658daee933a0ac2cfdcf25a625c82eb33d27