RFR: 8315651: Stop hiding AIX specific multicast socket errors via NetworkConfiguration (aix)

[Thomas Obermeier]

8315651: Stop hiding AIX specific multicast socket errors via NetworkConfiguration (aix)

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Commit messages:
 - copyright 2021 -> 2023
 - comment special AIX handling

Changes: https://git.openjdk.org/jdk/pull/15586/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15586&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315651
  Stats: 5 lines in 1 file changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15586.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15586/head:pull/15586

PR: https://git.openjdk.org/jdk/pull/15586