RFR: 1357: Add Oracle copyright header format check to jcheck

[Zhao Song]

This patch introduces a copyright jcheck.
For pull requests, the check checks the copyright header in all modified files(if the file name matches the regex in .jcheck/conf)

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Commit messages:
 - fix a copyright year
 - Fix a test
 - Fix test
 - update
 - SKARA-1357

Changes: https://git.openjdk.org/skara/pull/1702/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1702&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1357
  Stats: 460 lines in 12 files changed: 451 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/skara/pull/1702.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1702/head:pull/1702

PR: https://git.openjdk.org/skara/pull/1702