Potential Removal of JDK 8 Extraction Support

[schro...@google.com]

  The Kythe team is looking to remove legacy support for JDK 8 in the Kythe Java extractor.  This is a request for any feedback on that removal.  Specifically, are there any users that require such support?

  If we do decide to remove the JDK 8 support, we plan to cut a final release with it before carving it out so any lingering users can rely on that.

Thanks,

Cody