Drop py33 support for Liberty

Less is more:
https://wiki.openstack.org/wiki/Python3

Change-Id: I8a98b72f85bb29a3663c654613ac0d70fddbc1b1

Author: TerryHowe

setup.cfg

@@ -17,7 +17,7 @@ classifier =
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 2.6
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.3
+    Programming Language :: Python :: 3.4
 
 [files]
 packages =

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py33,py34,py26,py27,pep8
+envlist = py34,py26,py27,pep8
 skipdist = True
 
 [testenv]