[network model] Changes to network_model_hop_counter.cc for supporting broadcast
[network model] Changes to network_model_hop_counter.cc for supporting broadcast

victorisildur/Graphite,mit-carbon/Graphite,victorisildur/Graphite,nkawahara/Graphite,fhijaz/Graphite,mit-carbon/Graphite,8l/Graphite,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,nkawahara/Graphite,nkawahara/Graphite,nkawahara/Graphite,fhijaz/Graphite,victorisildur/Graphite,mit-carbon/Graphite-Cycle-Level,8l/Graphite,8l/Graphite,fhijaz/Graphite,mit-carbon/Graphite-Cycle-Level,victorisildur/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,mit-carbon/Graphite-Cycle-Level,8l/Graphite