RFR: 8345223: Remove doPrivileged in java.base/unix/classes/sun/net and java.base/macosx/classes/java/net classes after JEP 486 integration

[Daniel Fuchs]

Some doPrivileged were missed in some net classes when working on previous cleanups.

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Commit messages:
 - 8345223: Remove doPrivileged in java.base/unix/classes/sun/net and java.base/macosx/classes/java/net classes after JEP 486 integration

Changes: https://git.openjdk.org/jdk/pull/22447/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22447&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345223
  Stats: 80 lines in 3 files changed: 5 ins; 63 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/22447.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22447/head:pull/22447

PR: https://git.openjdk.org/jdk/pull/22447