RFR: 8310818: Refactor more Locale tests to use JUnit

[Justin Lu]

Please review this PR which refactors additional tests in Locale to use JUnit.

If a test was named bugNNNNNNN.java, it was renamed to something more descriptive.

Below is a list of all the changes

- Refactor and Rename Bug4175998Test.java as ISO639.java
- Refactor and Rename Bug8001562.java as JDK7LocaleServiceDiffs.java
- Refactor and Rename Bug8008577.java as ExpectedAdapterTypes.java
- Refactor Bug8025703.java
- Refactor and Rename Bug8026766.java as LRToString.java
- Refactor and Rename Bug8071929.java as ISO3166.java
- Refactor and Rename Bug8032842.java to PreserveTagCase.java

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Commit messages:
 - Rename Bug8032842.java to PreserveTagCase.java
 - Refactor Bug8032842.java to use JUnit
 - Rename Bug8071929.java as ISO3166.java
 - Refactor Bug8071929.java to use JUnit
 - Rename Bug8026766.java as LRToString.java
 - Refactor Bug8026766.java to use JUnit
 - Merge branch 'master' into MoreLocaleToJUnit
 - Rename Bug4175998Test.java as ISO639.java
 - Refactor Bug4175998Test.java to use JUnit
 - Add comment on outdated status
 - ... and 5 more: https://git.openjdk.org/jdk/compare/7db2f087...f065726e

Changes: https://git.openjdk.org/jdk/pull/14721/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14721&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310818
  Stats: 1350 lines in 12 files changed: 696 ins; 625 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/14721.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14721/head:pull/14721

PR: https://git.openjdk.org/jdk/pull/14721