Allow wardenized redis to run on bosh-lite

Move containers to ephemeral disk as was suggested [here](https://groups.google.com/a/cloudfoundry.org/forum/#!searchin/vcap-dev/Contrib-services$20on$20bosh-lite/vcap-dev/HIw3I4pa4y8/q_8SOHcDzlUJ).
Also updates services_warden to the versions used by cf-release. To support nested wardens.