Adjust queues on Ingestion 2 workers

The resque workers are very large – starting life at 200+ MB and growing to multiple gigabytes. A decent-sized mapping can take up half of the server's real memory and cause paging.

Do some combination of the following:

• Adjust the queues on the production workers so that only one or two mappers run on one box.

• Add production worker instances.

• Upsize the memory of worker-prod2.