%(tenant_id)s referenced in unit tests logging statement but doesn't exist in locals()

Which generates errors like this when running the tests:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/__init__.py", line 842, in emit
    msg = self.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 719, in format
    return fmt.format(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
KeyError: u'tenant_id'
Logged from file test_api.py, line 275

Line 275: LOG.debug("Deleting network %(network_id)s"\
                  " of tenant %(tenant_id)s", locals())