reconf: add test for the recovery routing function on the dspin_router
The test performs a reconfiguration of a cycle-free contour around a
blackhole in a 3x3 platform. The blackhole (faulty routers) is in
the cluster (1,1).
Introduce a reconf:xicu driver in the softs directory.
For now this driver contains only a getter/setter for the
configuration registers in the reconf:vci_xicu.
