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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.

(implement wait_proxy_sockets properly)

rmtree was only deleting directories but not files and sockets.

Especially important for large scale un-synchronized experiments

Includes an new DistributedExperiment class, a runner for distributed
experiments, a basic sequential runtime, and an example experiment
"dist_netperf" (although scaling beyond 2 hosts is currently still
broken in the rdma proxy).