When a daemon force-terminates, we don't get the show_help message it… #3517
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… was trying to send because the message is at a lower priority than the termination event. Resolve this by putting the oob in its own progress thread. Also, use only that one thread by default - if someone needs more progress threads in the OOB, they can use the MCA param to get them.
Signed-off-by: Ralph Castain rhc@open-mpi.org