ligo/scald/aggregator.py: add input option to specify tags to query for
Add an option in ligo/scald/aggregator
to query for a set of tags. This patch is necessary for the gstlal-online analysis to filter injection metrics from non-injection metrics.
I also increased the max messages from 2000 to 100,000, I think the max allowed by Kafka is 1M so hopefully that's okay. Otherwise, I will change it back.