[crac] RFR: Linux file system watcher support [v4]

[Anton Kozlov]

On Thu, 25 May 2023 09:26:01 GMT, joeylee <duke at openjdk.org> wrote:

>> inotify monitors changes on filesystem, this support automatic restore for LinuxFileWatcher.
>> 
>> FileWatcherAfterRestoreTest verifies watcher service works after restore.
>> FileWatcherTest verifies automatic closing inotiify fd
>> 
>> The watcher keys are still managed by user, so exception will be thrown if no watcher keys are leaked, as in FileWatcherWithOpenKeysTest
>
> joeylee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update

LGTM, thank you!

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Marked as reviewed by akozlov (Lead).

PR Review: https://git.openjdk.org/crac/pull/72#pullrequestreview-1470473093