hg: jdk/sandbox: sendchannels-branch: updated API and impl

[michael.x.mcmahon at oracle.com]

Changeset: 65a8550d9413
Author:    michaelm
Date:      2020-06-16 14:08 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/65a8550d9413

sendchannels-branch: updated API and impl

! src/java.base/share/classes/sun/net/ext/ExtendedSocketOptions.java
! src/java.base/share/classes/sun/nio/ch/UnixDomainSocketChannelImpl.java
! src/java.base/share/classes/sun/nio/ch/Util.java
! src/java.base/unix/native/libnio/ch/SocketDispatcher.c
! src/jdk.net/share/classes/jdk/net/ExtendedSocketOptions.java
! test/jdk/java/nio/channels/unixdomain/SendChannels.java