RFR 8195059: Update java.net Socket and DatagramSocket implementations to use Cleaner

[Roger Riggs]

Hi Florian,

Thanks for the reminder, I'll add it to 8196716 Refactor FileDescriptor 
FDCleanup <https://bugs.openjdk.java.net/browse/JDK-8196716>

Thanks, Roger

On 2/4/2018 4:17 PM, Florian Weimer wrote:
> * Roger Riggs:
>
>> Updated in place.
>>     http://cr.openjdk.java.net/~rriggs/webrev-net-cleanup-8195059/
> Doesn't this leak the file descriptor of SocketCleanable.register
> throws?