Why I did it
When lldpmgrd handled events of other tables besides PORT_TABLE, error message was printed to log.
How I did it
Handle event according to its file descriptor instead of looping all registered selectables for each coming event.
How to verify it
I verified same events are being handled by printing events key and operation, before and after the change.
Also, before the change, in init flow after config reload, when lldpmgrd handled events of other tables besides PORT_TABLE, error messages were printed to log, this issue is solved now.
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