Integrated: 8261273: RenderPerf test files should have GPL license without Classpath exception

[Alexey Ushakov]

Corrected headers

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Commit messages:
 - 8261273: RenderPerf test files should have GPL license without Classpath exception

Changes: https://git.openjdk.java.net/lanai/pull/178/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=178&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261273
  Stats: 62 lines in 5 files changed: 9 ins; 28 del; 25 mod
  Patch: https://git.openjdk.java.net/lanai/pull/178.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/178/head:pull/178

PR: https://git.openjdk.java.net/lanai/pull/178