[jdk17u-dev] RFR: 8330814: Cleanups for KeepAliveCache tests

[Amos Shi]

Backport of [JDK-8330814](https://bugs.openjdk.org/browse/JDK-8330814)
- This PR has two commits
- `commit 1` is a `clean` git patch from original commit
- `commit 2` is fixing the following compile error


----------System.err:(8/634)----------
/Users/I048686/SAPDevelop/github.com/dev-8330814-17/test/jdk/sun/net/www/http/KeepAliveCache/B5045306.java:73: error: no suitable method found for create(InetSocketAddress,int,String,SimpleHttpTransactionHandler)
            server = HttpServer.create(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0), 10, "/", new SimpleHttpTransactionHandler());
                               ^
    method HttpServer.create() is not applicable
      (actual and formal argument lists differ in length)
    method HttpServer.create(InetSocketAddress,int) is not applicable
      (actual and formal argument lists differ in length)
1 error
result: Failed. Compilation failed: Compilation failed


Testing
- Local: Test passed on `MacOS 14.6.1` on Apple M1 Max
  - `B5045306.java`: Test results: passed: 1
  - `B8291637.java`: Test results: passed: 1
  - `B8293562.java`: Test results: passed: 1
  - `KeepAliveProperty.java`: Test results: passed: 1
  - `KeepAliveTimerThread.java`: Test results: passed: 1
- Pipeline: 
- Testing Machine:

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

Commit messages:
 - Backport a5005c87c4d5598eb54e9824105767d833f9660b Fix Compilation error
 - Backport a5005c87c4d5598eb54e9824105767d833f9660b

Changes: https://git.openjdk.org/jdk17u-dev/pull/2813/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2813&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330814
  Stats: 290 lines in 5 files changed: 113 ins; 69 del; 108 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2813.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2813/head:pull/2813

PR: https://git.openjdk.org/jdk17u-dev/pull/2813