RFR: 8228434: jdk/net/Sockets/Test.java fails after JDK-8227642

[Severin Gehwolf]

Hi Mandy,

On Fri, 2019-07-19 at 10:32 -0700, Mandy Chung wrote:
> I still think separating container-specific APIs in its own class will 
> prevent running similar kind of issue in the future.

Take 03:
http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8228434/03/webrev/

This now reverts Platform.java changes to the version prior JDK-
8227642, introduces a Container class with one constant,
CONTAINER_ENGINE, and renames the jdk.test.docker.command property to
jdk.test.container.command.

Breakage as seen via jdk/net/Sockets/Test.java no longer exists as the
Platform class no longer loads an extra property.

Testing: jdk/net/Sockets/Test.java test, container tests with
docker/podman on Linux x86_64.

Thoughts?

Thanks,
Severin