RFR: 8352879: TestPeriod.java and TestGetContentType.java run wrong test class

[Zihao Lin]

Fix TestPeriod.java and TestGetContentType.java run wrong test class.

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Commit messages:
 - Merge branch 'openjdk:master' into JDK-8352879
 - fix tests

Changes: https://git.openjdk.org/jdk/pull/24312/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352879
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/24312.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24312/head:pull/24312

PR: https://git.openjdk.org/jdk/pull/24312