stack strace when test timeout

[Tristan Yan]

Hi Jon
Recently I'm working on regression bugs. I found some regression bugs 
failed with timeout very randomly. It's very hard to reproduce the 
failure even we try more than thousand times retry. This make me wonder 
is there any way we can setup for jtreg we can get java stack strace 
when timeout occurs. This definitely will help to analysis the failure. 
Is there a config that already exists in jtreg? Can we expect it if it 
is not.
Thank you
Tristan
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