[crac] RFR: Support passing extra options in CREngine [v3]

[Anton Kozlov]

On Tue, 13 Jun 2023 13:46:20 GMT, Radim Vansa <duke at openjdk.org> wrote:

>> In addition to `-XX:CREngine=program` this adds support to `-XX:CREngine=program,--key,value,--anotherkey` that translates into invoking `program --key value --anotherkey`. Commas support escaping with a backslash.
>> 
>> This generic parameters support is utilized in `criuengine` that accepts `--verbosity` and `--log-file` options and relays them to `criu`.
>
> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixup

Marked as reviewed by akozlov (Lead).

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PR Review: https://git.openjdk.org/crac/pull/63#pullrequestreview-1477649648