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

Updates to modelnet torus plugin: reporting torus average+maximum latency and hops traversed via model-net API function

Adding the torus network plugin with modelnet API, see model-net/README_MN_TEST.txt for instructions to run the test

Adding the torus network plugin with modelnet API, see model-net/README_MN_TEST.txt for instructions to run the test

Updates to model-net test program based on the new config file format. We can now configure all network parameters from the config file

Adding back the simplenet magic check (it works fine for the case where there the modelnet and server LPs are on the same PE)