RFR: 8333344: JMX attaching of Subject does not work when security manager not allowed [v14]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 19 additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into 8333344_JMX_Subject
 - Monitor: do not call doAs with an explicityly null Subject
 - Unnecessary catches to remove
 - Monitor update
 - ServerNotifForwarder simplification
 - Separate SM allowed and not allowed cases
 - ServerNotifForwarder getSubject update
 - Exception handling per Daniel comment
 - Annotation in checkAccess
 -  Undo test policy updates
 - ... and 9 more: https://git.openjdk.org/jdk/compare/c0b2e87b...ee2dd12e

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19624/files
  - new: https://git.openjdk.org/jdk/pull/19624/files/13d9202f..ee2dd12e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19624&range=13
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19624&range=12-13

  Stats: 15038 lines in 603 files changed: 6231 ins; 7274 del; 1533 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