First cut at removal of Security Manager stuff from RMI. This covers just about every SM-related case in RMI, except for a bit of package checking in MarshalInputStream. This will be handled separately. It's covered by [JDK-8344329](https://bugs.openjdk.org/browse/JDK-8344329).
Further simplifications could be done in RuntimeUtil and NewThreadAction. However, those changes started to become somewhat more intrusive than I'd like for this PR, which is focused on removing security-related stuff. ------------- Commit messages: - First cut at removal of Security Manager stuff from RMI. Changes: https://git.openjdk.org/jdk/pull/22129/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22129&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8344149 Stats: 717 lines in 27 files changed: 6 ins; 549 del; 162 mod Patch: https://git.openjdk.org/jdk/pull/22129.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22129/head:pull/22129 PR: https://git.openjdk.org/jdk/pull/22129
