[jdk8u-dev] RFR: 8207404: MulticastSocket tests failing on AIX

[Ilarion Nakonechnyy]

This backport fixes the tier2 test:
FAILED: java/net/MulticastSocket/JoinLeave.java -- The socket name is not available on this system. (Error setting socket option)

Changes are applied non-cleanly. 
Tested on AIX 7.2

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Commit messages:
 - Backport bc651663e31ddf05d59bfe6fc7a70c3a7ed708af

Changes: https://git.openjdk.org/jdk8u-dev/pull/347/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=347&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8207404
  Stats: 376 lines in 4 files changed: 181 ins; 137 del; 58 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/347.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/347/head:pull/347

PR: https://git.openjdk.org/jdk8u-dev/pull/347