8221259: New tests for java.net.Socket to exercise long standing behavior

[Alan Bateman]

There are a number of tests in niosocketimpl-branch of the sandbox that 
are needed to exercise Socket in ways that aren't fully exercised by the 
existing tests. I'd like to bring some of these tests into jdk/jdk in 
advance of the new NIO based SocketImpl, specifically:

- AsyncShutdown: invoke shutdownInput/shutdownOutput when a thread is 
blocked in read/write
- ConnectionReset: tests the behavior specified by 
Socket::getInputStream for cases where a connection is reset with data 
and no data available
- UdpSocket: uses a deprecated Socket constructor to create UDP socket
- Timeouts: test timed connect, read and accept operations. This tests 
several scenarios that the existing tests using timeouts do not exercise.

The webrev with the tests is here:
   http://cr.openjdk.java.net/~alanb/8221259/webrev/

-Alan