[network] Add a function to get the core from the network
[network] Add a function to get the core from the network

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