Fixing a minor bug in the model-net test case, the number of servers was...

Fixing a minor bug in the model-net test case, the number of servers was specified incorrectly for the simplenet case

tests/modelnet-test-torus.conf

@@ -13,7 +13,7 @@ PARAMS
    modelnet="torus";
    message_size="512";
    n_dims="4";
-   dim_length="4,2,2,2";
+   dim_length="2,2,2,2";
    link_bandwidth="2.0";
    buffer_size="256";
    num_vc="1";