Fix TorusZone with limiter links
Raises an std::out_of_range exception when it tries to add the limiter
link to routes.
Example:
<cluster id="bob_cluster" topology="TORUS" topo_parameters="3,2,2"
prefix="node-" radical="0-11" suffix=".simgrid.org"
speed="1Gf" bw="125MBps" lat="50us"
loopback_bw="100MBps" loopback_lat="0" limiter_link="100MBps"/>
Not sure if someone uses this limiter. We don't have any test that uses limiter_link tag inside a
TORUS cluster. It'll be added in with the new C++ interface.
