jmx-dev RFR: 8345045: Remove the jmx.remote.x.buffer.size JMX notification property

[Kevin Walls]

jmx.remote.x.buffer.size was a previous and incorrect name for the jmx.remote.x.notification.buffer.size property.  

The old name was still recognised to aid compatibility.
That was 2004.  We should only recognise the correct name at this point.

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Commit messages:
 - 8345045: Remove the jmx.remote.x.buffer.size JMX notification property

Changes: https://git.openjdk.org/jdk/pull/23145/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23145&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345045
  Stats: 33 lines in 2 files changed: 0 ins; 24 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/23145.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23145/head:pull/23145

PR: https://git.openjdk.org/jdk/pull/23145