Workflow
************************

1. Define the network graph, creating instances of model.Node and
   model.DIF classes.

2. Create an instance of a Testbed class.

3. Create an instance of the selected prototype.Experiment class,
   passing the testbed instance and a list of Node instances.

  1. At the end of the base Experiment constructor, the
     generate function is called to generate information about
     per-node IPCPs, registrations and enrollment, ready to be
     used by the plugins.

4. Call methods on the prototype.Experiment instance:

  1. swap_in() swaps the experiment in on the testbed, and fills in
     the missing information in the model.

  2. install_prototype() installs the chosen prototype on the
     testbed. Currently an Ubuntu image is assumed.

  3. bootstrap_prototype() calls a prototype-specific setup function,
     to create the required IPCPs, perform registrations,
     enrollments, etc.

  4. swap_out() swaps the experiment out of the testbed.

5. Run a Storyboard to emulate real network traffic.


Accessing nodes after swap-in
-----------------------------

To access a node once the experiment is swapped in, use the following
command (in the same terminal where ssh-agent was run in case of jFed): ::

    $ rumba-access $NODE_NAME

Where $NODE_NAME is the name of the node to access.