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: I4b24bf9ddd1c009d23eb601de09be1fd0c2bda6f
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

tox.ini

@@ -118,6 +118,7 @@ commands =
 
 
 [testenv:linters]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-ansible-env-prep.sh"
     {[testenv:pep8]commands}