* Create S3 data source type for EDP
* Support storing S3 secret key in Castellan
* Unit tests for new data source type
* Document new data source type and related ideas
* Add support of S3 configs into Spark and Oozie workflows
* Hide S3 credentials in job execution info, like for Swift
* Release note
Change-Id: I3ae5b9879b54f81d34bc7cd6a6f754347ce82f33
Jeremy Freudberg