Hidden exception when creating a backup with swift backend

[Michal Dulko]

When issuing a "cinder backup-create <vol_id>" command an exception in c-bak logs can be noticed:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/__init__.py", line 851, in emit
    msg = self.format(record)
  File "/usr/local/lib/python2.7/dist-packages/oslo_log/handlers.py", line 69, in format
    return logging.StreamHandler.format(self, record)
  File "/usr/lib/python2.7/logging/__init__.py", line 724, in format
    return fmt.format(record)
  File "/usr/local/lib/python2.7/dist-packages/oslo_log/formatters.py", line 235, in format
    return logging.Formatter.format(self, record)
  File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
    record.message = record.getMessage()
  File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
    msg = msg % self.args
TypeError: not enough arguments for format string
Logged from file swift.py, line 149

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/165927

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/165927
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=a83b93a0da44c37ce4ca7750c4cc1e0149263bf2
Submitter: Jenkins
Branch: master

commit a83b93a0da44c37ce4ca7750c4cc1e0149263bf2
Author: Michal Dulko <email address hidden>
Date: Thu Mar 19 21:53:46 2015 +0100

    Fix logging mistake in swift backup driver

    After recent swift driver refactoring a small mistake was introduced
    causing c-bak to log an exception because of wrong number of arguments
    to format a string. This commit fixes the issue.

    Change-Id: I2e322ae6a2495771c89fa25ab5474da20eecc80d
    Closes-Bug: 1434188