[jdk11u-dev] RFR: 8228960: [TESTBUG] containers/docker/TestJcmdWithSideCar.java: jcmd reports main class as 'Unknown'

[Antonio Vieiro]

Backport of [JDK-8228960](https://bugs.openjdk.org/browse/JDK-8228960) for parity with 11.0.24-oracle
This also paves the way for future container-related tests.

Tested on Fedora 40 with Docker version 27.0.1, build 7fafd33


==============================
Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/hotspot/jtreg/containers/docker/TestJcmdWithSideCar.java
                                                         1     1     0     0   
==============================
TEST SUCCESS


Backport is clean but for a single empty newline in `test/hotspot/jtreg/ProblemList.txt`,  that was introduced by [JDK-8228904](https://bugs.openjdk.org/browse/JDK-8228904) (see commit [e3aa4909](https://github.com/openjdk/jdk/commit/e3aa4909dffc2346b28364aed7fdfff4ff1771b6) ) which was not backported to 11.

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

Commit messages:
 - Backport 489f8027be30be42dcebdf6330ad73ed7f70a5e0

Changes: https://git.openjdk.org/jdk11u-dev/pull/2822/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2822&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8228960
  Stats: 136 lines in 3 files changed: 57 ins; 43 del; 36 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2822.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2822/head:pull/2822

PR: https://git.openjdk.org/jdk11u-dev/pull/2822