[jdk17u-dev] RFR: 8295087: Manual Test to Automated Test Conversion

[Amos Shi]

Backport of [JDK-8295087](https://bugs.openjdk.org/browse/JDK-8295087)
- This PR contains two commit
  - `Commit 1` is generated by git apply from original commit
  - `Commit 2` is adding the missing test case `InconsistentEntries.java`, which was originally added by [JDK-8286779](https://bugs.openjdk.org/browse/JDK-8286779)

Testing
- Local: Test passed on `MacOS 14.5` on Apple M1 Max
  - `ExtDirs.java`: Test results: passed: 2
  - `ExtDirsChange.java`: Test results: passed: 1
  - `ExtDirsDefaultPolicy.java`: Test results: passed: 4
  - `InconsistentEntries.java`: Test results: passed: 1
- Pipeline: 
- Testing Machine:

-------------

Commit messages:
 - Backport a3693ccc617d06137a61050b34646e8a90ed3d7e Add test InconsistentEntries
 - Backport a3693ccc617d06137a61050b34646e8a90ed3d7e

Changes: https://git.openjdk.org/jdk17u-dev/pull/2774/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2774&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295087
  Stats: 221 lines in 13 files changed: 144 ins; 26 del; 51 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2774.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2774/head:pull/2774

PR: https://git.openjdk.org/jdk17u-dev/pull/2774