hg: jdk/sandbox: 8233296: MulticastSocket getOption/setOption inverts the value of IP_MULTICAST_LOOP

[chris.hegarty at oracle.com]

Changeset: 55fdee124e89
Author:    dfuchs
Date:      2019-11-22 11:52 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/55fdee124e89

8233296: MulticastSocket getOption/setOption inverts the value of IP_MULTICAST_LOOP
Summary: MulticastSocket.getOption(StandardSocketOption.IP_MULTICAST_LOOP) now returns true if loopback mode is enabled, and MulticastSocket.setOption(StandardSocketOption.IP_MULTICAST_LOOP, true) enables loopback mode. No other behavioral changes.
Reviewed-by: alanb, chegar

! src/java.base/share/classes/java/net/AbstractPlainDatagramSocketImpl.java
+ test/jdk/java/net/MulticastSocket/SetLoopbackOption.java
! test/jdk/java/net/SocketOption/OptionsTest.java