RFR: 8344215: Remove calls to SecurityManager and doPrivileged in java.net.Socket and java.net.ServerSocket after JEP 486 integration

[Volkan Yazıcı]

I'd appreciate a review of this change set removing `SecurityManager` et al. from `java.net.Socket` and `java.net.ServerSocket`.

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Commit messages:
 - 8344215: Remove Security Manager et al. from `Socket` and `ServerSocket`

Changes: https://git.openjdk.org/jdk/pull/22254/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22254&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344215
  Stats: 112 lines in 2 files changed: 0 ins; 106 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22254.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22254/head:pull/22254

PR: https://git.openjdk.org/jdk/pull/22254