RFR: 8238761: Asynchronous handshakes [v2]

[Patricio Chilano Mateo]

On Thu, 17 Sep 2020 18:57:33 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed double checks
>>   Added NSV
>>   ProcessResult to enum
>>   Fixed logging
>>   Moved _active_handshaker to private
>
> Changes look good, thanks for fixing! I added some comments on the changes.

Update looks good, thanks Robbin!

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PR: https://git.openjdk.java.net/jdk/pull/151