[crac] RFR: Environment vars propagation into restored process [v3]

[Anton Kozlov]

On Mon, 3 Oct 2022 08:21:56 GMT, Roman Marchenko <duke at openjdk.org> wrote:

>> This PR provides functionality to propagate actual environment variables to a restored process, as well as the test for this functionality.
>> 
>> Env propagation is done in few steps:
>> - Store the actual environment before restoring
>> - After restoring, replace the restored `environ` with a new one.
>> - On `afterRestore` event, propagate the new environment into a restored process via `ProcessEnvironment`.
>
> Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixing review comments

Merging is fine to me. I think policy, etc will be implemented on top, extending the functionality of this PR.

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PR: https://git.openjdk.org/crac/pull/30