RFR 8163561, add a test for Proxy Authentication in HTTP/2 Client API

[Chris Hegarty]

On 18 Aug 2016, at 10:26, Felix Yang <felix.yang at oracle.com> wrote:
> 
> Hi all,
> 
>    please review a new test, which tries to verify "Proxy-Authenticate" header can be handled correctly.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8163561
> 
> Webrev: http://cr.openjdk.java.net/~xiaofeya/8163561/webrev.00/

Thank you Felix, this mainly looks good. Just some small comments:

1) You do not need the serverReady latch. Once MyProxy is created it is ok
    for the client to initiate a connection before the thread has started running.
    The ServerSocket is already created and listening.

2) authLatch could be replaced with a volatile boolean, since the authenticator
    is guaranteed ( if there is no bug ) to be called before the CompletableFuture
    of HttpResponse.

3) In MyProxy please line up the AutoCloseables underneath each other.

4) Authenticator.setDefault(auth); is not needed, right?

-Chris.