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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.

This adds a new component E2ESimbricksNetwork to the end-to-end
framework, which allows to connect to other simulated networks through
Simbricks.

This avoids issues for parameter strings containing characters that are
treated specially while parsing the arguments, e.g. whitespace.

Instead of passing all parameters using the command line, we write them
first into a file and then pass the filename to the end-to-end
framework.

Use the new basic building blocks SwitchNode and SimpleChannel in the
ns3 end-to-end framework to build topologies.

This adds support for configuring and running simulations using the ns3
end-to-end framework.

This temporarily drops support for DDIO and the L3 cache.

ExpEnv hd_path and hd_path_raw use absolute path unmodified if given as param

Update to newer ns-3 version and adapt code for changes (mostly
renamed files and command line parameters) in the ns-3 submodule.

This change is mostly about the default semantics of asyncio.wait(). It
doesn't forward any exceptions that are raised by any of the coroutines
it waits for. This effectively causes exceptions to be swallowed. In
contrast, asyncio.gather() forwards exceptions to its calling coroutine.

The reason we didn't spot this earlier is that exceptions were swallowed
by the call to `asyncio.wait()` in
`runners.py:ExperimentBaseRunner.terminate_collect_sims()` when invoking
`int_term_kill()`. Instead, we now use `asyncio.gather()`, which
forwards exceptions to the calling coroutine.

Currently --repo, which is used to find simulators etc., defaults to '..',
which only works when executing in the 'experiments' directory in the simbricks
repo. Instead we make this relative to the run.py-file's path.