tree fca3d5128c8606846ec665ab1642298ee4c93cf0
parent 75661b5b957abef7e55cd99bc1f46647e4203415
author huang.zhiping <huang.zhiping@99cloud.net> 1528482191 +0800
committer huang.zhiping <huang.zhiping@99cloud.net> 1528482234 +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: I86a48214708a9169996b1dfa7eb9a825dfb3468e