RFR [9] 8150163: JarFileSystem support for MRJARs should use the JDK specific Version API

[Chris Hegarty]

To support MRJARs, currently JarFileSystem uses sun.misc.Version to retrieve the
major version. It should be updated to use the new JDK specific Version API. 

http://cr.openjdk.java.net/~chegar/8150163/
https://bugs.openjdk.java.net/browse/JDK-8150163

-Chris.