RFR: 8366031: Mark com/sun/nio/sctp/SctpChannel/CloseDescriptors.java as intermittent

[SendaoYan]

The test com/sun/nio/sctp/SctpChannel/CloseDescriptors.java observed intermittent fails. Before the root cause of failure has been fixed, should we mark this test `@key intermittent`, to make some setups skip this test or re-run this test when it's fails.

After the failure root cause has been fixed, we should remove the `@key intermittent` in test definition.

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Commit messages:
 - 8366031: Mark com/sun/nio/sctp/SctpChannel/CloseDescriptors.java as @intermittent

Changes: https://git.openjdk.org/jdk/pull/26910/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26910&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366031
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26910.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26910/head:pull/26910

PR: https://git.openjdk.org/jdk/pull/26910