[crac] RFR: API for restore time [v2]

[Anton Kozlov]

On Fri, 16 Sep 2022 19:07:54 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> This PR adds an ability to get restore time, similar to RuntimeMXBean.getUptime() [1] and getStartTime(). Before I used to print timestamps and parse console output, which was not very convenient.
>> 
>> [1] https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/RuntimeMXBean.html#getUptime()
>
> Anton Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Guarantee len

OK, I think this was hanging long enough already :) It blocks further works, so I'm going to integrate this.

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PR: https://git.openjdk.org/crac/pull/29