RFR: 8249824: s/n/w/p/https/HttpsURLConnection/CloseKeepAliveCached.java uses @ignore w/o bugid

[Mikhail Yankelevich]

* fully automated the test
* removed the race condition
* client on a thread and server on a thread options are now run together automatically

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Commit messages:
 - JDK-8249824: s/n/w/p/https/HttpsURLConnection/CloseKeepAliveCached.java uses @ignore w/o bugid

Changes: https://git.openjdk.org/jdk/pull/23469/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23469&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8249824
  Stats: 108 lines in 1 file changed: 59 ins; 19 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/23469.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23469/head:pull/23469

PR: https://git.openjdk.org/jdk/pull/23469