the parameters of the function of registerMeterBandSerializer need to be more refined

Since we have used ExperimenterIdMeterSubTypeSerializerKey as MeterBandSerializer's key, in order to avoid the occurrence of an error, we should add a new function(public void registerMeterBandSerializer(final ExperimenterIdMeterSubTypeSerializerKey<MeterBandExperimenterCase> key,
final OFSerializer<MeterBandExperimenterCase> serializer)) and discard the old function( public void registerMeterBandSerializer(final ExperimenterIdSerializerKey<MeterBandExperimenterCase> key,
final OFSerializer<MeterBandExperimenterCase> serializer))