RFR: 8298514: vmTestbase/nsk/jdi/EventRequestManager/threadDeathRequests/thrdeathreq002/TestDescription.java fails with usage tracker

[Alex Menkov]

One more test fix to ignore ThreadDeathEvent event from non-test threads waiting for breakpoint

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Commit messages:
 - Fixed thrdeathreq002 test

Changes: https://git.openjdk.org/jdk/pull/11621/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11621&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298514
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11621.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11621/head:pull/11621

PR: https://git.openjdk.org/jdk/pull/11621