RFR: 8284550: test failure_handler is not properly invoking jhsdb jstack, resulting in failure to produce a stack when a test times out

[Leonid Mesnik]

…resulting in failure to produce a stack when a test times out

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Commit messages:
 - 8284550: test failure_handler is not properly invoking jhsdb jstack, resulting in failure to produce a stack when a test times out

Changes: https://git.openjdk.java.net/jdk/pull/8588/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8588&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284550
  Stats: 7 lines in 1 file changed: 1 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8588.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8588/head:pull/8588

PR: https://git.openjdk.java.net/jdk/pull/8588