RFR: 8163798: Create a JarFile versionedStream method

[Steve Drach]

I made a simple change, the new webrev is http://cr.openjdk.java.net/~sdrach/8163798/webrev.02/ <http://cr.openjdk.java.net/~sdrach/8163798/webrev.02/>

> On Sep 9, 2016, at 4:02 PM, Steve Drach <steve.drach at oracle.com> wrote:
> 
> Hi,
> 
> Please review this changeset that adds a VersionedStream class to the jdk.internal.util.jar package.  Some may recall that I submitted a similar RFR a few weeks ago; this is a redesign from that one.  We decided not to make a public JarFile::versionedStream method at this time.  Once we get sufficient experience with this and find a few more use cases, we will revisit the idea of making this a public method in JarFile.
> 
> issue: https://bugs.openjdk.java.net/browse/JDK-8163798 <https://bugs.openjdk.java.net/browse/JDK-8163798>
> webrev: http://cr.openjdk.java.net/~sdrach/8163798/webrev.01/index.html <http://cr.openjdk.java.net/~sdrach/8163798/webrev.01/index.html>
> 
> Thanks,
> Steve