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Only show one message when we start to wait, and one when we succeeded.

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.

Aim is to introduce different types of ports.

To support use-cases with multiple NIC interfaces.

for CFLAGS, CXXFLAGS, CPPFLAGS, VFLAGS

Useful for huge pages.

Still disabled by default because of rdma library dependencies.

(implement wait_proxy_sockets properly)

rmtree was only deleting directories but not files and sockets.

Especially important for large scale un-synchronized experiments

Previously net_rdma still exited with success.

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

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).

Again prepration for distributed experiments.