<AWT Dev> [9] Review Request: 8035169 Move ThreadGroupUtils from the sun.misc package

[Petr Pchelko]

Hello, AWT Team.

Please review the fix for the issue:
https://bugs.openjdk.java.net/browse/JDK-8035169
The fix is available at: 
http://cr.openjdk.java.net/~pchelko/9/8035169/webrev/

The ThreadGroupUtils class was added to sun.misc, but it's a bad 
practice for modularization. We should move it somewhere to AWT. 
Here I've put it to sun.awt.util. Nothing.s changed except moving the
class.

With best regards. Petr.