ByteStreamEmonSvc: Read L1 item name to ID mapping from L1Menu instead of IS
Remove ancient (Run-1) code for mapping L1 item names to IDs from
ByteStreamEmonSvc and replace with Run-3 solution. The old code (which was decorated with a comment calling it "pure madness"
ReadHandle<TrigConf::L1Menu>. The name to ID mapping will be now read from TriggerDB instead of IS.
Tested already to work at P1. I saw:
2021-10-20 17:57:38,136 ByteStreamInputSvc DEBUG Reading L1Menu to map LVL1Names to CTP IDs 2021-10-20 17:57:38,136 ByteStreamInputSvc DEBUG Item L1_RD0_EMPTY mapped to CTP ID 118