RFR: 8344177: Remove SecurityManager and related calls from src/java.management

[Kevin Walls]

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

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Commit messages:
 - 8344177: Remove SecurityManager and related calls from src/java.management

Changes: https://git.openjdk.org/jdk/pull/22100/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22100&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344177
  Stats: 1439 lines in 51 files changed: 10 ins; 1240 del; 189 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