RFR: 8294399: (ch) Refactor some methods out of sun.nio.ch.UnixFileDispatcherImpl [v2]

[Brian Burkhalter]

On Mon, 26 Sep 2022 22:17:23 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Interpose a new class `sun.nio.ch.UnixDispatcher` between `sun.nio.ch.NativeDispatcher` and its current subclasses `sun.nio.ch.DatagramDispatcher` and `sun.nio.ch.SocketDispatcher`; refactor some methods out of `sun.nio.ch.UnixFileDispatcherImpl` into this updated hierarchy.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8294399: Correct copyright years

Ping.

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PR: https://git.openjdk.org/jdk/pull/10434