actually print out the traceback when the download thread won't die.  Add a note giving a hint to use non-threaded updates when debugging update code
actually print out the traceback when the download thread won't die.  Add a
note giving a hint to use non-threaded updates when debugging update code

sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary