RFR: 8344969: Remove the jmx.mxbean.multiname compatibility property [v2]

[Serguei Spitsyn]

On Thu, 16 Jan 2025 09:31:11 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> Remove the System Property "jmx.mxbean.multiname" which was introduced in JDK-7 for compatibility with code which may have depended on previous incorrect behaviour.  Removal is long overdue.
>
> Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:
> 
>   test update/simplification

Marked as reviewed by sspitsyn (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23131#pullrequestreview-2557880547