[network/hop_counter] Fix calculation of network topology.
[network/hop_counter] Fix calculation of network topology.

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