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Just memcpy risks the received reading incomplete messages.

This allows NetListen to be done before other intialization, so that
listening sockets for peers are created already. This makes
orchestration a lot easier. E.g. listener proxy will have listening
sockets for peers already created when still waiting for connector proxy
to connect.

Preparation to add additional proxy implementations.

Uses a TCP socket to exchange connection info.

Previously net_rdma still exited with success.

Used d2n values before. (worked because these are symmetric in the cases
I've tested so far)

With this longer tests (5sec iperf with kvm) work without problems now.