[jdk17u-dev] RFR: 8272777: Clean up remaining AccessController warnings in test library

[Amos Shi]

Backport of [JDK-8272777](https://bugs.openjdk.org/browse/JDK-8272777)

Testing
- Local: Not Applicable ??

Error: Cannot determine test suite from test (is TEST.ROOT missing?): github.com/dev-8272777-17/test/lib/jdk/test/lib/SA/SATestUtils.java
Error: Cannot determine test suite from test (is TEST.ROOT missing?): github.com/dev-8272777-17/test/lib/jdk/test/lib/net/IPSupport.java
Error: Cannot determine test suite from test (is TEST.ROOT missing?): github.com/dev-8272777-17/test/lib/jdk/test/lib/net/SimpleSSLContext.java


- Pipeline: 
- Testing Machine:

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Commit messages:
 - Backport 63a00a0df24b154ef459936dbd69bcd2f0626235

Changes: https://git.openjdk.org/jdk17u-dev/pull/2573/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2573&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8272777
  Stats: 4 lines in 3 files changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2573.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2573/head:pull/2573

PR: https://git.openjdk.org/jdk17u-dev/pull/2573