rumba: Add namespace testbed (nstb) with per-node namespacesbe

Add a single-host testbed that gives each node its own Linux network +
mount namespace, wired together with veth pairs and per-layer bridges,
plus an nsenter executor that runs commands inside a node's namespace.

The per-node mount namespace mounts a private tmpfs over each of the
filesystem trees Ouroboros pins at compile time, so exactly one IRMd
owns each per node. This lets a single host place clients and servers
on distinct nodes and exercise real multi-hop forwarding.

Requires CAP_SYS_ADMIN (root / sudo), e.g. a privileged container.

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

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