[jdk11u-dev] RFR: 8249812: java/net/DatagramSocket/PortUnreachable.java still fails intermittently with SocketTimeoutException

[Andrew Lu]

I backport this for parity with 11.0.22-oracle.

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Commit messages:
 - Backport 9f23c2c159fdb992edc4023f9dc5e9e88b15e53e

Changes: https://git.openjdk.org/jdk11u-dev/pull/2285/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2285&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8249812
  Stats: 47 lines in 1 file changed: 18 ins; 3 del; 26 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2285.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2285/head:pull/2285

PR: https://git.openjdk.org/jdk11u-dev/pull/2285