Investigate / silence Kafka errors

[martinjohndyer]

The new hop client (#84) works well it seems, but the logs get full of rather annoying errors:

2024-07-29 14:11:32.085:DEBUG - Received notice: ivo://gwnet/LVC#MS240729o-1-Preliminary
2024-07-29 14:11:32.186:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729o-1-Preliminary
2024-07-29 14:11:32.187:DEBUG - Ignoring test notice
2024-07-29 14:16:07.133:DEBUG - Received notice: ivo://gwnet/LVC#MS240729o-2-Preliminary
2024-07-29 14:16:07.135:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729o-2-Preliminary
2024-07-29 14:16:07.135:DEBUG - Ignoring test notice
2024-07-29 14:21:27.187:DEBUG - Received notice: ivo://gwnet/LVC#MS240729o-3-Initial
2024-07-29 14:21:27.257:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729o-3-Initial
2024-07-29 14:21:27.380:DEBUG - Ignoring test notice
2024-07-29 14:31:27.331:ERROR - internal kafka error: KafkaError{code=_TRANSPORT,val=-195,str="GroupCoordinator: kafka1.gcn.nasa.gov:9092: Failed to connect to broker at [2600:1f10:4f61:4a00:79d8:1a49:534a:ee9]:9092: Network is unreachable (after 24ms in state CONNECT)"}
2024-07-29 14:41:28.150:ERROR - internal kafka error: KafkaError{code=_TRANSPORT,val=-195,str="GroupCoordinator: kafka1.gcn.nasa.gov:9092: Failed to connect to broker at [2600:1f10:4f61:4a00:79d8:1a49:534a:ee9]:9092: Network is unreachable (after 138ms in state CONNECT)"}
2024-07-29 14:51:28.817:ERROR - internal kafka error: KafkaError{code=_TRANSPORT,val=-195,str="GroupCoordinator: kafka1.gcn.nasa.gov:9092: Failed to connect to broker at [2600:1f10:4f61:4a00:79d8:1a49:534a:ee9]:9092: Network is unreachable (after 32ms in state CONNECT)"}
2024-07-29 15:11:30.195:ERROR - internal kafka error: KafkaError{code=_TRANSPORT,val=-195,str="GroupCoordinator: kafka1.gcn.nasa.gov:9092: Failed to connect to broker at [2600:1f10:4f61:4a00:79d8:1a49:534a:ee9]:9092: Network is unreachable (after 38ms in state CONNECT)"}
2024-07-29 15:11:32.714:DEBUG - Received notice: ivo://gwnet/LVC#MS240729p-1-Preliminary
2024-07-29 15:11:32.784:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729p-1-Preliminary
2024-07-29 15:11:32.785:DEBUG - Ignoring test notice
2024-07-29 15:16:08.763:DEBUG - Received notice: ivo://gwnet/LVC#MS240729p-2-Preliminary
2024-07-29 15:16:08.840:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729p-2-Preliminary
2024-07-29 15:16:08.840:DEBUG - Ignoring test notice
2024-07-29 15:21:27.818:DEBUG - Received notice: ivo://gwnet/LVC#MS240729p-3-Initial
2024-07-29 15:21:27.865:DEBUG - Processing new notice: ivo://gwnet/LVC#MS240729p-3-Initial
2024-07-29 15:21:27.866:DEBUG - Ignoring test notice

Those internal kafka error lines seem to come from here:
https://github.com/astronomy-commons/adc-streaming/blob/b1a5a81c52d2752a9fd63b9717c121285646d09b/adc/errors.py#L12-L21

The system seems to be running fine, and the errors aren't fatal. It's not easy to research, https://stackoverflow.com/a/60389747 leads to a GitHub issue mentioning "At this time an application should consider all errors informational, and not terminal." In which case I'd rather just shut the errors up, I'm not even sure how they're finding their way into our logger (and stdout for that matter).