RFR: 8253750: use build-stable default seed for Utils.RANDOM_GENERATOR

[Igor Ignatyev]

On Tue, 29 Sep 2020 00:06:02 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

> Hi all,
> 
> could you please review the patch which updates `jdk.test.lib.Utils` to use md5 hash-sum of `java.vm.version` property
> as default seed for `Utils.RANDOM_GENERATOR`?
> from JBS:
>> using the same seed for all runs of a build will make it possible (easier) to compare results from different test runs
>> (e.g. on different platforms, w/ different flags) and consequently will make test results analysis easier.
> 
> the patch also updates `RandomGeneratorTest` test, so it expects now that the same values are generated if no seed is
> provided.
> testing: ✅ tier1

ping?

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PR: https://git.openjdk.java.net/jdk/pull/391