Comment 5 for bug 1327476

Reviewed: https://review.openstack.org/99119
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8f8b6e656a6ef06bf0b99068a07a7d194783fc9b
Submitter: Jenkins
Branch: master

commit 8f8b6e656a6ef06bf0b99068a07a7d194783fc9b
Author: Matt Riedemann <email address hidden>
Date: Tue Jun 10 08:07:03 2014 -0700

    Handle string types for InstanceActionEvent exc_tb serialization

    Commit 59a6cf233b538d6666740de4796fce25ed8265aa added code to handle
    serializing non-str exception traceback objects, but didn't account for
    unicode. This change uses six.string_types to handle str and unicode
    objects for the exc_tb argument.

    Adds a new unit test for the unicode case and firms up two existing
    tests for how traceback.format_tb is mocked (or shouldn't be in the case
    of exc_tb being a str).

    Closes-Bug: #1327476

    Change-Id: Icc10b62a3f65610c50e86c0b366c2b70b1a0932d