'provide the driver the current set of plugboards and a function to
select a specific plugboard. This method is called immediately before
add_books and sync_booklists.
pb_func is a callable with the following signature::
def pb_func(device_name, format, plugboards)
You give it the current device name (either the class name or
DEVICE_PLUGBOARD_NAME), the format you are interested in (a \'real\'
format or \'device_db\'), and the plugboards (you were given those by
set_plugboards, the same place you got this method).
:return: None or a single plugboard instance.'

def set_plugboards(self, plugboards, pb_func):

    pass
