can have a pub_endpoint and a sub_endpoint that are not equal but go
to the same place (fd). I didn't think that that was possible. :-\
So just use a bool to track whether we have forwarded the fragment at
all; if we have, then don't forward to the sub_endpoint.
IOF is going to be re-written for v1.4.
This commit was SVN r18950.
The following SVN revision numbers were found above:
r18873 --> open-mpi/ompi@773c92a6eb