RFR: 8206863: A closed JarVerifier.VerifierStream should throw IOException

[Martin Buchholz]

Here's another fix from Tobias and myself:

8206863: A closed JarVerifier.VerifierStream should throw IOException
http://cr.openjdk.java.net/~martin/webrevs/jdk/JarVerifier-stream-closed/
https://bugs.openjdk.java.net/browse/JDK-8206863