[jdk11u-dev] RFR: 8315602: Open source swing security manager test

[Amos Shi]

Backport of [JDK-8315602](https://bugs.openjdk.org/browse/JDK-8315602)
- This PR has two commits
- Commit 1 is a clean back port of original commit
- Commit 2 is the fix for test case error `ClassNotFoundException: allow`

Testing
- Local: Passed
- Pipeline: 
- Testing Machine:

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Commit messages:
 - 8315602 Fix [ClassNotFoundException: allow] error on java 11
 - Backport fd6442c079748dcaff3bb565dc35b108b68a61bd

Changes: https://git.openjdk.org/jdk11u-dev/pull/2520/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2520&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315602
  Stats: 55 lines in 1 file changed: 55 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2520.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2520/head:pull/2520

PR: https://git.openjdk.org/jdk11u-dev/pull/2520