RFR: 8255964: Add jcmd Thread.print to jtreg timeout handler [v2]

[Nils Eliasson]

> This patch adds jcmd Thread.print to the jtreg timeout handler.
> 
> Please review.

Nils Eliasson has updated the pull request incrementally with one additional commit since the last revision:

  add extended printing to jstack

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1080/files
  - new: https://git.openjdk.java.net/jdk/pull/1080/files/2451660c..2ca47884

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1080&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1080&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1080.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1080/head:pull/1080

PR: https://git.openjdk.java.net/jdk/pull/1080