Logging does not deal well with paths that contain %

[Manuel de la Peña]

The following occurs if just a path is found:

Logged from file sync.py, line 294
Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/handlers.py", line 77, in emit
    if self.shouldRollover(record):
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/logger.py", line 114, in shouldRollover
    msg = "%s\n" % self.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 723, 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
ValueError: unsupported format character '_' (0x5f) at index 299