HADOOP-16050 switched S3A to trying to use OpenSSL. We need to make sure this is stable, that people know it exists and aren't left wondering why things which did work have now stopped. Which, given I know who will end up with those support calls, is not something I want.
- Set the default back to the original JDK version.
- Document how to change this so you don't need to use an IDE to work out what other values are allowed
- core-default.xml to include the default value and the text listing the other options.
+ anything else