UndergroundFeeder.device_type is set as HarpOutputExpander #67
Description
As UndergroundFeeder subclasses HarpOutputExpander without overriding device_type, the device_type for UndergroundFeeder is "HarpOutputExpander".
This means that when we auto-generate the stream tables in aeon_mecha streams_maker.py (which sets the table name using device_type), the UndergroundFeeder table is named HarpOutputExpander.