Patch for Enhancement Bug # 6313849 and 417591

[Andreas Schaefer]

I added the disconnect() method to the java.net.URLConnection class and
the implementation to its subclasses. I create the Disconnect.java test
class which tests that  the InputStreams are closed and the a reconnect
is possible.

The file disconnect.sh, Disconnect.java and foo2.jar should go into
trunk/j2se/test/java/net/URLConnection.

This is my first patch for the OpenJDK and so I would love to do it from
start to finish. Please let me know if something does not work out or if
I should change any of this.

Thank you - Andy Schaefer
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