[11u] RFR: 8222299: [TESTBUG] move hotspot container tests to hotspot/containers

[Langer, Christoph]

Hi,

please review the backport of 8222299: [TESTBUG] move hotspot container tests to hotspot/containers. This is something that Oracle has brought back to 11.0.5.

Bug: https://bugs.openjdk.java.net/browse/JDK-8222299
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8222299.11u-dev.0/

There needed to be some adaptions to the original fix. Firstly, changes to the following files really don't apply to 11u so these were skipped:
/doc/testing.html
/doc/testing.md
test/hotspot/jtreg/ProblemList.txt

Then, the set of files needing to be moved from test/hotspot/jtreg/runtime/containers to test/hotspot/jtreg/containers is different in current jdk11u-dev compared to the original change. So I manually moved everything from the former location to the latter. And eventually I tried to make the change in test/lib/jdk/test/lib/containers/docker/DockerTestUtils.java fit to the current state of the code in there.

@Severin: don't know if there's some interference with your docker test work...

Thanks
Christoph