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experiments/simbricks/orchestration/nodeconfig: config_files takes additional env parameter for better path resolution

Allow users to specify custom paths to p4.
Co-authored-by: Antoine Kaufmann <antoinek@mpi-sws.org>

The solution here was quite hacky in that we modified gem5's checkpoint file to have a timestamp of 0. This actually breaks when simulating a Linux host and conducting time measurements. The numbers you get will end up all over the place.

This removes automatically sorting the keys that I introduced in #97, which means that instead, attributes are serialized in the order they are defined in. With this change, simple information like start and end time are readable at a glance directly at the top of the JSON file.

allows callers to add a name suffix for each connection, so there are separate unix sockets.

this allows this to be called on all networks for mixed experiments.

So far NIC sims would directly modify the NetSim's list, not giving the
opportunity for subclasses to override. This istead adds a method for this.

Useful for running ns-3 only simulations.

Add a new method init_network to NS3E2ENet that does some initialization
before the experiment is run. It should be called after all components
were added to the network.

This introduces the E2ELinkAssigner that can automatically create links
of given types and create all the necessary NS3E2ENet instances.