FlexRAN: make agent_id for identification purposes, discern from mod_id
The agent_id is a uint64 consisting of: module ID (i.e. mod_id, the several instances of OAI at once, 16 bit), the enb_id from the configuration file (32 bit) and the cell_id from the configuration file (16 bit). The module ID is part of the agent ID but it is easier to have it directly in the struct.
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