Tracebacks should be logged

[cicdw]

When unexpected errors occur, we currently only log the repr of the caught exception. I propose that we should begin logging tracebacks for better visibility into issues. To do so requires two steps:

• begin logging caught exceptions with logger.exception(msg) (this will require a full audit; some caught exceptions are currently being logged as "INFO", others as "DEBUG")
• in the CloudHandler itself, include traceback text by:

if record.exc_text is not None:
    record.message += "\n" + record.exc_text