RFR: 8333344: JMX attaching of Subject does not work when security manager not allowed [v6]

[Kevin Walls]

> JMX uses APIs related to the Security Mananger which are deprecated.  Use of AccessControlContext will be removed when Security Manager is removed.
> 
> Until then, updates are needed to not require setting  -Djava.security.manager=allow to use JMX authentication.

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

   Undo test policy updates

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19624/files
  - new: https://git.openjdk.org/jdk/pull/19624/files/9664bef6..6f072338

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19624&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19624&range=04-05

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19624.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19624/head:pull/19624

PR: https://git.openjdk.org/jdk/pull/19624