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WIP: Always reuse the incoming connection to the rank 0 reader

Eisenhauer, Greg requested to merge github/fork/eisenhauer/SSTRank0ConnReuse into master

Always reuse the incoming connection to the rank 0 reader rather than using CMget_conn() to get a new one. This is no real change with public IP on both sides because CMget_conn() should just return that incoming connection. However if the reader is behind a NAT, CMget_conn() wouldn't work and initiating a new connection won't work either. This will allow limited functionality for 1x1 staging with a private reader.

Currently creating the PR to run this through the sanitizers.

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