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Useful for tracking dependencies etc and simplifies multi-NIC handling

For largescale experiment we otherwise run out of IPs

As described in paper

this allows the shared memory regions to be created in /dev/shm/ e.g.
instead of the work dir.

Can now select between sockets (default) or rdma.

Instead of static ordering of simulator types. This simpliefies the
experiment runners but also simplifies adding additional features.
Immeadiate goal is adding network-to-network connections

Preparation to add additional proxy implementations.