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It's accessed from both poll thread and IO thread

Because dev/net_info are packed gcc does not seem to align them
properly.

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.

To add manual infiniband initalization as an alternative in a next step.

Still disabled by default because of rdma library dependencies.

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.