RFR: 8344105: Remove SecurityManager and related calls from jdk.attach and jdk.hotspot.agent

[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:
 - Property fetch update
 - 8344105: Remove SecurityManager and related calls from jdk.attach and jdk.hotspot.agent

Changes: https://git.openjdk.org/jdk/pull/22067/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22067&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344105
  Stats: 77 lines in 9 files changed: 0 ins; 67 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/22067.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22067/head:pull/22067

PR: https://git.openjdk.org/jdk/pull/22067