RFR: 8367869: Test java/io/FileDescriptor/Sync.java timed out

[SendaoYan]

Hi all,

After [JDK-8260555](https://bugs.openjdk.org/browse/JDK-8260555) changed the default TIMEOUT_FACTOR from 4 to 1, test java/io/FileDescriptor/Sync.java intermittent timed out when run with other test simultancely.

If I run this test seperately, it shows that test exhaust about 40+ seconds to finish on linux-x64 machine with release jdk build.

This PR change the test count from 10_000 to 1_000, this will make test exhaust less time to finish. I think 1_000 will be enough.

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Commit messages:
 - 8367869: Test java/io/FileDescriptor/Sync.java timed out

Changes: https://git.openjdk.org/jdk/pull/27344/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27344&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367869
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27344.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27344/head:pull/27344

PR: https://git.openjdk.org/jdk/pull/27344