review: Add a command line toggle for worker.debug

[David Hill]

Kevin,

https://bugs.openjdk.java.net/browse/JDK-8153110
Add a command line toggle for worker.debug

There is a diff inline in the bug that works for toggling worker.debug from the gradle command line

-- 
David Hill<David.Hill at Oracle.com>
Java Embedded Development

"A man's feet should be planted in his country, but his eyes should survey the world."
-- George Santayana (1863 - 1952)