RFR: 8344177: Remove SecurityManager and related calls from java.management [v4]

[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 incrementally with two additional commits since the last revision:

 - space
 - space

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22100/files
  - new: https://git.openjdk.org/jdk/pull/22100/files/df6ee04c..3a524945

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22100&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22100&range=02-03

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 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