Add Python 3.5 classifier and venv

Now that there is a passing gate job, we can claim support for
Python 3.5 in the classifier. This patch also adds the convenience
py35 venv and removes py33 venv.

Change-Id: I849e9df878b18f89424c846511bc131644ccae48

setup.cfg

@@ -16,8 +16,8 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.3
     Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
 
 [files]
 packages =

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py34,py27,pypy,pep8
+envlist = py35,py34,py27,pypy,pep8
 
 [testenv]
 deps = -r{toxinidir}/test-requirements.txt
@@ -17,6 +17,10 @@ commands = oslo_debug_helper {posargs}
 basepython = python3.4
 commands = oslo_debug_helper {posargs}
 
+[testenv:debug-py35]
+basepython = python3.5
+commands = oslo_debug_helper {posargs}
+
 [testenv:pep8]
 commands = flake8