[mpiwg-coll] backward communication in neighborhood collectives

[Junchao Zhang]

 I want to try MPI neighborhood collectives. I have a communication graph
and want to do both forward and backward communication along the edges.
With current APIs, it looks I need to create two comm_dist_graphs. It is a
waste since MPI implementations can do similar optimizations for the two.
 Should MPI support this scenario?  Thanks.

--Junchao Zhang
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