RFR: 8274888: Dump "-DReproduce=true" to the test VM command line output

[Vladimir Kozlov]

On Wed, 20 Oct 2021 11:55:59 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> When trying to rerun a failure of the test VM, one can copy the test VM command line printed to the output and directly use that one. But this requires to additionally set `-DReproduce=true` to mock the driver VM. This patch improves the manual work of adding `-DReproduce=true` and dumps it now automatically as part of the command line printed on failures.
> 
> Thanks,
> Christian

Marked as reviewed by kvn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6039