RFR: 8344446: Remove security manager dependency from module jdk.sctp

[Brian Burkhalter]

Expunge the use of the `SecurityManager`, `AccessController`, and the like from the `jdk.sctp` module.

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Commit messages:
 - 8344446: Remove security manager dependency from module jdk.sctp

Changes: https://git.openjdk.org/jdk/pull/22225/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22225&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344446
  Stats: 99 lines in 4 files changed: 2 ins; 90 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/22225.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22225/head:pull/22225

PR: https://git.openjdk.org/jdk/pull/22225