genomics: Provide only 4G of hub storage
genomics: Provide only 4G of hub storage

datahub needs 40g since it gets a lot of traffic, and we store
all the logs. Don't think genomics needs that much.

berkeley-dsep-infra/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub