Consider changing Docker logging configuration

[dolsysmith]

Docker recommends using the local driver, which provides compressed storage. Currently, we are using the json-file driver, which does not compress the logs on disk and results in pretty hefty log files over time.

Not sure if this would improve readability of the logs -- it's currently kind of a pain to review them for long-running containers: even docker logs <CONTAINER ID> | tail takes awhile to run...