[OpenJDK 2D-Dev] [9] Review Request: 8177628 Opensource unit/regression tests for ImageIO

[Sergey Bylokhov]

Hello,
Please review the fix for jdk9.

This fix is a part of the effort to opensource the tests in jdk.
In the fix a number of tests for ImageIO are moved to the open ws.
Note that most of the code moved as-is, and probably can be improved in the future, but I tried to limit the number of changes in this move.

Bug: https://bugs.openjdk.java.net/browse/JDK-8177628
Webrev can be found at: http://cr.openjdk.java.net/~serb/8177628/webrev.00
The same fix for JavaSound: http://mail.openjdk.java.net/pipermail/sound-dev/2016-October/000472.html