[jdk11u-dev] RFR: 8241336: Some java.net tests failed with NoRouteToHostException on MacOS with special network configuration

[Christoph Langer]

Backport of JDK-8241336

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Commit messages:
 - Backport 5ddbcb7a515e29d805df17ca2977eeb720adef29

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/296/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=296&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8241336
  Stats: 103 lines in 3 files changed: 65 ins; 6 del; 32 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/296.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/296/head:pull/296

PR: https://git.openjdk.java.net/jdk11u-dev/pull/296