tree a8832045e8914312dbb12f8f19b0f490219328e6
parent a23f4074fd458b74e9de1a583b7812e1ef855bce
author qingszhao <zhao.daqing@99cloud.net> 1528782818 +0800
committer qingszhao <zhao.daqing@99cloud.net> 1528782861 +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: I4ef8678c433cc593db64f596a320d16bc1215eb1