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(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.

preparation for remote execution, some directories need to be cleaned
up/created on the remote host some locally

With remote excution those sockets will be on the remote host

(preparation for remote commands)

Preparation for remote execution

With this longer tests (5sec iperf with kvm) work without problems now.