RFR: 8344252: SM cleanup in java.util classes

[Roger Riggs]

Remove use of doPrivileged and SecurityManager in java.util.

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Commit messages:
 - 8344252: SM cleanup in java.util classes

Changes: https://git.openjdk.org/jdk/pull/22122/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22122&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344252
  Stats: 367 lines in 13 files changed: 36 ins; 204 del; 127 mod
  Patch: https://git.openjdk.org/jdk/pull/22122.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22122/head:pull/22122

PR: https://git.openjdk.org/jdk/pull/22122