RFR - 8132734: java.util.jar.* changes to support multi-release jar files

[Steve Drach]

>> Okay. On the the ZipFileSystem then it would be good to get a summary on what you are proposing.
> 
> Details of any JavacFileManager/ZipFileSystem support are still being hashed out. They are mentioned in the JEP and we can update once those details are finalized.

To elaborate a bit, the implementation is quite straight forward.  ZipFileSystem builds an Inode tree on open.  That tree is implemented as a Map<Inode,Inode>.  For regular zip/jar files both the key and the value are the same Inode.  For multi-release jar files the value is the Inode of the appropriate versioned entry.  Configuration is through the Map<String,?> env parameter to the FileSystems.newFileSystem parameter.