The ability to build (when applicable) and bundle the tests that are in
the JDK source code at the same time as the product is built is needed.
(JDK-8067759)
This change provides basic infra structure for creating a test image and
bundling it in the same manner as other images/bundles
No tests are added to the image/bundle by this change. Tests can be
added by creating a rule that puts them in the $(TEST_IMAGE_DIR) and
having the 'test-image' make target depend on it.
Bug: https://bugs.openjdk.java.net/browse/JDK-8067759
WebRev: http://cr.openjdk.java.net/~ehelin/ingo/8067759/webrev.01/
