RFR: 8298966: Deprecate JMX Subject Delegation and the method JMXConnector.getMBeanServerConnection(Subject) for removal.

[Kevin Walls]

Deprecate the Java Management Extension (JMX) Subject Delegation feature for removal in a future release.

Given no known usage, there is no replacement feature for JMX Subject Delegation.

CSR is https://bugs.openjdk.org/browse/JDK-8298967

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Commit messages:
 - 8298966: Deprecate JMX Subject Delegation and the method JMXConnector.getMBeanServerConnection(Subject) for removal.

Changes: https://git.openjdk.org/jdk/pull/11880/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11880&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298966
  Stats: 7 lines in 2 files changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11880.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11880/head:pull/11880

PR: https://git.openjdk.org/jdk/pull/11880