RFR: 8344077: Remove security manager dependency in java.io [v2]

[Brian Burkhalter]

> Expunge the use of the `SecurityManager`, `AccessController`, and the like from the `java.io` package.

Brian Burkhalter has updated the pull request incrementally with two additional commits since the last revision:

 - 8344446: Address review comments
 - 8344446: Remove security manager dependency from module jdk.sctp

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22219/files
  - new: https://git.openjdk.org/jdk/pull/22219/files/d31cec1b..c7ba3354

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22219&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22219&range=00-01

  Stats: 62 lines in 5 files changed: 0 ins; 56 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22219/head:pull/22219

PR: https://git.openjdk.org/jdk/pull/22219