RFR: 8298979: Remove duplicated serviceability/jvmti/thread/GetAllThreads/allthr01/allthr01.java [v2]

[Leonid Mesnik]

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

Leonid Mesnik has updated the pull request incrementally with two additional commits since the last revision:

 - cleanup
 - used get_thread_name

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12240/files
  - new: https://git.openjdk.org/jdk/pull/12240/files/661a6082..01479d0d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12240&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12240&range=00-01

  Stats: 26 lines in 1 file changed: 1 ins; 15 del; 10 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