The Nova project now has clean tox py34 runs with a limited set of the UT. This change set fixes two existing py34 issues and allows py34 to run cleanly. The fixed issues are: - Use the 'builtins' module instead of __builtin__. - Don't log exceptions before they are raised. Change-Id: Ib66e36c54353833b8ec35ff6f34b3cd81d609334