Set a status to report back to the server.

def SetStatus(self, status, message="", backtrace=None):
    """Set a status to report back to the server."""
    self.status.status = status
    self.status.error_message = utils.SmartUnicode(message)
    if backtrace:
      self.status.backtrace = utils.SmartUnicode(backtrace)