rumba: Generalize testbeds for per-node-namespace

Prepare the framework for the new testbed that runs multiple IRMds
using Linux namespaces. Adds capabilities on the Testbed base class:

  - needs_install:            build/install the prototype on the nodes
  - single_irmd:              one in-process IRMd, driven locally
  - terminate_before_swapout: reap the prototype before swap_out tears
                              down the context it runs in

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>

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