[jdk11u-dev] RFR: 8211092: test/jdk/sun/net/www/http/HttpClient/MultiThreadTest.java fails intermittently when cleaning up

[Aleksey Shipilev]

Backporting for `11.0.13-oracle` parity. The 11u patch misses the ProblemList removals, as both the addition and removal only happened in 12. (See JDK-8211099 and dependents).

Additional testing:
 - [x] Affected test still passes

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

Commit messages:
 - Backport 20f6faa03049bdb70089dd773686ebc749d4f57a

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/224/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=224&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8211092
  Stats: 39 lines in 1 file changed: 24 ins; 3 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/224.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/224/head:pull/224

PR: https://git.openjdk.java.net/jdk11u-dev/pull/224