Integrated: 8260247: Move RenderPerfTest from demo to test directory

[Alexey Ushakov]

Moved perf test to the new location

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Commit messages:
 - 8260247: Move RenderPerfTest from demo to test directory

Changes: https://git.openjdk.java.net/lanai/pull/159/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=159&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260247
  Stats: 0 lines in 6 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/159.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/159/head:pull/159

PR: https://git.openjdk.java.net/lanai/pull/159