Don't run example for old pythons

Examples/python/import_packages/namespace_pkg/runme.py

@@ -1,5 +1,10 @@
 import os, sys, setupPkg
 
+# These examples rely on namespace packages.  Don't
+# run them for old python interpreters.
+if sys.version_info < (3, 3, 0):
+    sys.exit(0)
+
 setupPkg.copyMods()
 
 # Run each test with a seperate interpreter