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These are currently not correct and trigger randomly because of races.

fixes corrupted intro message and re-enables build of proxy in all
target.

Otherwise on a full queue we might overwrite entries repeatedly causing
all sorts of mayhem.

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.