RFR: 8316387: Exclude more failing multicast tests on AIX after JDK-8315651

[Alan Bateman]

On Fri, 15 Sep 2023 21:40:03 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> [JDK-8315651](https://bugs.openjdk.org/browse/JDK-8315651) has removed a facility to hide errors of the type that is described in [JDK-8308807](https://bugs.openjdk.org/browse/JDK-8308807) from the test scaffolding.
> 
> Now we see more multicast tests failing on AIX and we should exclude them with reference to [JDK-8308807](https://bugs.openjdk.org/browse/JDK-8308807).

Looks okay, just surprised there aren't a lot more DatagramChannel tests needing to be excluded.

-------------

Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15770#pullrequestreview-1629915604