[jdk17u-dev] RFR: 6381945: (cal) Japanese calendar unit test system should avoid multiple static imports

[Martin Doerr]

Backport of [JDK-6381945](https://bugs.openjdk.org/browse/JDK-6381945).

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Commit messages:
 - Backport f79b3d42f07b703f0e3b9fc67c92dee260b0e602

Changes: https://git.openjdk.org/jdk17u-dev/pull/1647/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1647&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6381945
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1647.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1647/head:pull/1647

PR: https://git.openjdk.org/jdk17u-dev/pull/1647