prototypes: Add local Ouroboros support

This adds local Ouroboros support in case of a fake testbed (i.e. no
resources allocated). A next PR will abstract away the mode of
communication with the testbed, since the Docker plugin will also need
it.

This also adds another function to the model, terminate_prototype,
which should clean up the prototype gracefully, or can be skipped
depending on the testbed.

Currently the ouroboros plugin with the fake testbed needs to be run
as root. If there is a way to run the command as root in the
background and then clean it up properly, I would be happy to know
how.

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