[rfc][icedtea-web] PluginAppletViewer unit tests with test extensions for mocking plugin input&output pipes

[Adam Domurad]

This is an attempt to enable unit testing of hard-to-test parts of 
icedtea-web.
It introduces a new class 'PluginPipeMock' that allows the requests 
coming from the plugin to be read one-by-one, and the ability to send 
mocked replies.
This is possible thanks to that fact that PluginStreamHandler takes 
arbitrary and InputStream&OutputStream.

Attached are unit tests for PluginAppletViewer.eval, 
PluginAppletViewer.call, PluginAppletViewer.toString and 
PluginAppletViewer.JavascriptFinalize.
While the javascript-related functionality is mocked, the 
responsibilities from the Java-side of things are tested.

It may be worth looking into using iostream's on the C++ side and 
mocking them similarly (for the unfamiliar, they are also classes that 
can be inherited from, so a similar approach can be taken).
Even better would be to provide the C++ side with some NPAPI-enabled 
javascript engine to interface with so we can fully test the javascript 
stuff with unit tests.

ChangeLog:
2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

     * Makefile.am
     (stamps/test-extensions-compile.stamp): Make plugin classes available
     to test extensions
     * tests/test-extensions/net/sourceforge/jnlp/AsyncCallWithTimeout.java:
     New, helper for doing asynchronous calls with a given timeout. Returns
     an exit code.
     * tests/test-extensions/sun/applet/PluginPipeMessages.java: New, helper
     for verifying plugin messages and getting the reference number.
     * tests/netx/unit/sun/applet/PluginAppletViewerTest.java: New, uses
     PluginPipeMock to test the javascript requests to the plygin.
     * tests/test-extensions/sun/applet/mock/PluginPipeMock.java: New, 
helper
     for getting the plugin requests and mocking the replies.
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