Updated python debug target from 3.4 to 3.5
Changing the python debug target in tox.in to use py35 from py34.
@@ -28,8 +28,8 @@ commands = oslo_debug_helper {posargs}
basepython = python2.7
commands = oslo_debug_helper {posargs}
-[testenv:debug-py34]
-basepython = python3.4
+[testenv:debug-py35]
+basepython = python3.5
commands = oslo_debug_helper {posargs}
[testenv:pep8]
