Logging fails with an exception when unicode conversion of the message
cannot be performed.
This includes also Exception objects, where the exception message has
an unknown encoding.
The calling code should be responsible for handling the unicode encoding, but
nevertheless, the logging module should handle this scenario and not raise
an exception.
Closes-Bug: #1393870
Change-Id: Ied46e4a8715d11a3cf59d651004e17f6fe4c760b
5344904f27