RFR: 8344177: Remove SecurityManager and related calls from java.management [v8]

[Kevin Walls]

> Remove redundant SecurityManager, AccessController references
> (following on from JDK-8338411: Implement JEP 486: Permanently Disable the Security Manager).

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 16 additional commits since the last revision:

 - Exception handling
 - tidyup
 - Suppression tidyup
 - unnecessary variables
 - remove redundant method
 - Merge remote-tracking branch 'upstream/master' into java_management_post_sm
 - ReflectUtil removals
 - Remove checkPackageAccess calls
 - Remove Util.check... calls
 - mostly removing imports
 - ... and 6 more: https://git.openjdk.org/jdk/compare/2b351ce8...9628234f

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22100/files
  - new: https://git.openjdk.org/jdk/pull/22100/files/a330df5f..9628234f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22100&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22100&range=06-07

  Stats: 112504 lines in 1858 files changed: 54747 ins; 48923 del; 8834 mod
  Patch: https://git.openjdk.org/jdk/pull/22100.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22100/head:pull/22100

PR: https://git.openjdk.org/jdk/pull/22100