<i18n dev> RFR: JDK-8316559: Refactor some util/Calendar tests to JUnit [v4]

[Justin Lu]

> Please review this PR which converts some tests under _Calendar_ to use JUnit. These tests either previously used the internal _IntlTest_, or used no framework at all. 
> 
> Any files named BugXXXXXXX.java will be renamed after review.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  white space

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15853/files
  - new: https://git.openjdk.org/jdk/pull/15853/files/99fd7b24..db54d231

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15853&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15853&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15853.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15853/head:pull/15853

PR: https://git.openjdk.org/jdk/pull/15853