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: I1ab75bc1ebaec7559f4078add7a164b152064f39
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

tox.ini

@@ -22,15 +22,18 @@ commands =
 
 
 [testenv:bandit]
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r zunclient -x tests -n5 -ll
 
 [testenv:pypy]
+basepython = python3
 deps = setuptools<3.2
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper -t zunclient/tests {posargs}
 
 [testenv:debug-py27]
@@ -42,6 +45,7 @@ basepython = python3.4
 commands = oslo_debug_helper -t zunclient/tests {posargs}
 
 [testenv:docs]
+basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
@@ -50,12 +54,14 @@ commands =
   sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pep8]
+basepython = python3
 commands =
   flake8
   # Run security linter
   bandit -r zunclient -x tests -n5 -ll
 
 [testenv:releasenotes]
+basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
@@ -64,9 +70,11 @@ commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = {toxinidir}/tools/cover.sh {posargs}
 
 [flake8]