CBIT-532: Remove refs to CBFS, dev_preview1, add s3_upload function

Change-Id: If17335b341bf9e9b3f5305cb73e3f170c3f75c99
Reviewed-on: http://review.couchbase.org/37486
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>