RFR: JDK-8265928: update copyright in several files

[Hamlin Li]

I missed update the copyrights in several files, and per suggested in https://github.com/openjdk/jdk/pull/2379#pullrequestreview-584943730, it's better to update them in a separate CR, this is the one to fix them in a batch.

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Commit messages:
 - copyrights update.

Changes: https://git.openjdk.java.net/jdk/pull/3682/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3682&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265928
  Stats: 18 lines in 18 files changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3682.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3682/head:pull/3682

PR: https://git.openjdk.java.net/jdk/pull/3682