[jdk11u-dev] RFR: 8264824: java/net/Inet6Address/B6206527.java doesn't close ServerSocket properly

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

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Commit messages:
 - Backport 6293299dd341721b33424c7012b1123bb267cabb

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/424/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=424&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264824
  Stats: 11 lines in 1 file changed: 2 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/424.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/424/head:pull/424

PR: https://git.openjdk.java.net/jdk11u-dev/pull/424