Merge "fix tox python3 overrides"

ovsdbapp/exceptions.py

@@ -37,7 +37,7 @@ class OvsdbAppException(RuntimeError):
 
     if six.PY2:
         def __unicode__(self):
-            return unicode(self.msg)  # noqa
+            return unicode(self.msg)  # noqa pylint: disable=undefined-variable
 
     def __str__(self):
         return self.msg

tox.ini

@@ -17,24 +17,29 @@ deps =
 commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 commands = flake8
            {toxinidir}/tools/coding-checks.sh --all '{posargs}'
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
+basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:functional]