RFR: 8298979: Remove duplicated serviceability/jvmti/thread/GetAllThreads/allthr01/allthr01.java

[Leonid Mesnik]

PR adds fix "8284027: vmTestbase/nsk/jvmti/GetAllThreads/allthr001/ is failing" to new test and remove duplication.

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Commit messages:
 - cp
 - fix

Changes: https://git.openjdk.org/jdk/pull/12240/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12240&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298979
  Stats: 856 lines in 11 files changed: 45 ins; 782 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/12240.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12240/head:pull/12240

PR: https://git.openjdk.org/jdk/pull/12240