<i18n dev> RFR: 8286154: Fix 3rd party notices in test files

[Naoto Sato]

Trivial fix to 3rd party copyright notices.

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Commit messages:
 - 8286154: Fix 3rd party notices in test files

Changes: https://git.openjdk.java.net/jdk/pull/8558/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8558&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286154
  Stats: 100 lines in 21 files changed: 64 ins; 0 del; 36 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8558.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8558/head:pull/8558

PR: https://git.openjdk.java.net/jdk/pull/8558