RFR: 8345987: java.management has two Util.newObjectName methods (remove one)

[Kevin Walls]

Unnecessary duplication of small utility method.  There should be only one Util.newObjectName().

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Commit messages:
 - 8345987: java.management has two Util.newObjectName methods (remove one)

Changes: https://git.openjdk.org/jdk/pull/22681/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22681&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345987
  Stats: 22 lines in 5 files changed: 6 ins; 8 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/22681.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22681/head:pull/22681

PR: https://git.openjdk.org/jdk/pull/22681