RFR: 8313612: Use JUnit in lib-test/jdk tests [v3]

[Qing Xiao]

> Modified all tests under lib-test/jdk to use JUnit

Qing Xiao has updated the pull request incrementally with one additional commit since the last revision:

  Change test static method to instance method

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15131/files
  - new: https://git.openjdk.org/jdk/pull/15131/files/0e15e752..e520735d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15131&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15131&range=01-02

  Stats: 13 lines in 4 files changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/15131.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15131/head:pull/15131

PR: https://git.openjdk.org/jdk/pull/15131