RFR: 8262081: vmTestbase/nsk/jdi/ThreadDeathRequest/addThreadFilter/addthreadfilter001/TestDescription.java failed with "ERROR: eventSet1.size() != 3 :: 2"

[Alex Menkov]

The fix updates the test to use special method to wait for ThreadDeathEvent for the specific thread, ignoring event from other threads

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Commit messages:
 - Filter out events from unexpected threads

Changes: https://git.openjdk.java.net/jdk/pull/3133/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3133&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262081
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3133.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3133/head:pull/3133

PR: https://git.openjdk.java.net/jdk/pull/3133