[jdk21u-dev] RFR: 8366866: SslRMIClientSocketFactory#createSocket lacking priviledges (securitymanger)

[Ralf Schmelter]

Backport for parity with 21.0.11-oracle.

- added missing doPrivileged() calls when accessing the two system properties used in SslRMIClientSocketFactory
- adjusted additionally to change 8341496, which added another system property to check and was missing the doPrivileged() call too
- added test

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Commit messages:
 - Fixed line endings.
 - Merge branch 'master' of https://github.com/openjdk/jdk21u-dev into jdk-8366866-for-jdk21
 - Adjust to JDK-8341496.
 - Merged with head. Needed copyright header resolve.
 - Merge branch 'master' of https://github.com/openjdk/jdk21u-dev into jdk-8366866-for-jdk21
 - Updated copyright year.
 - Fixed copyright.
 - Add missing doPrivileged() and test.

Changes: https://git.openjdk.org/jdk21u-dev/pull/2564/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2564&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366866
  Stats: 68 lines in 3 files changed: 63 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2564.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2564/head:pull/2564

PR: https://git.openjdk.org/jdk21u-dev/pull/2564