Silent traceback in unittests

[Sergey Kraynev]

Currently Heat has stable traceback in uittests output:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/__init__.py", line 851, in emit
    msg = self.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 724, in format
    return fmt.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 467, in format
    s = self._fmt % record.__dict__
  File "/home/skr/heat/.tox/py27/local/lib/python2.7/site-packages/oslo_i18n/_message.py", line 167, in __str__
    raise UnicodeError(msg)

Note, that this traceback does not break heat test.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/157003

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/157003
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=d6ed31c05d9766949181d17ebd5a5f4d8a9fc436
Submitter: Jenkins
Branch: master

commit d6ed31c05d9766949181d17ebd5a5f4d8a9fc436
Author: Sergey Kraynev <email address hidden>
Date: Wed Feb 18 09:03:08 2015 -0500

    Translate exception in the right way

    - Add lazy translation for some missed messages
    - Fix traceback in unittest due to wrong logging

    Change-Id: I4a499309bea8a1e4d9b7ff9bcc84e3a76e16c329
    Closes-Bug: #1423189