8217500: (sc) Move SocketChannelImpl's remaining native methods to Net

[Brian Burkhalter]

I think this looks good.

Brian

> On Jan 22, 2019, at 3:14 AM, Alan Bateman <Alan.Bateman at oracle.com> wrote:
> 
> This is another refactoring patch, this time to move the two remaining (socket oriented) native methods from sun.nio.ch.SocketChannelImpl to sun.nio.ch.Net <http://sun.nio.ch.net/>. This will make the sun.nio.ch.Net <http://sun.nio.ch.net/> class more useful, more on this soon. I've used the opportunity to remove the Unix version of SocketDispatcher.c has that has not been needed since the switch to the new build system in JDK 8.
> 
> One small complication with this refactoring is technical debt in the SCTP implementation where it was makes direct use of the native method SocketChannelImpl.checkConnect. That usage seems to be broken since JDK 11 but has gone unnoticed, maybe because there aren't too many deploying doing non-blocking connects with SCTP.  The SCTP tests that exercise this code path are passing on the systems that I can find with SCTP support.
> 
> The webrev with the proposed changes is here:
>   http://cr.openjdk.java.net/~alanb/8217500/webrev/index.html <http://cr.openjdk.java.net/~alanb/8217500/webrev/index.html>
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