RFR: 8255913: Decrease number of iterations in TestMaxCachedBufferSize

[Brian Burkhalter]

Please review this test-only change to TestMaxCachedBufferSize. The test times out frequently, primarily on older hardware. The proposed change is to decrease the number of iterations in the test, which should not compromise its value.

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Commit messages:
 - 8255913: Decrease number of iterations in TestMaxCachedBufferSize

Changes: https://git.openjdk.java.net/jdk/pull/1066/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1066&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255913
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1066.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1066/head:pull/1066

PR: https://git.openjdk.java.net/jdk/pull/1066