git: openjdk/mobile: 8233989: Create an IPv4 version of java/net/MulticastSocket/SetLoopbackMode.java

[duke]

Changeset: 78accb56
Author:    Patrick Concannon <pconcannon at openjdk.org>
Date:      2019-11-14 11:04:57 +0000
URL:       https://git.openjdk.java.net/mobile/commit/78accb56

8233989: Create an IPv4 version of java/net/MulticastSocket/SetLoopbackMode.java

This fix adds an IPv4 version of test SetLoopbackMode.java that calls SetLoopbackMode in IPv4 only mode, and runs only if IPv4 is enabled.

Reviewed-by: dfuchs

! test/jdk/java/net/MulticastSocket/SetLoopbackMode.java
+ test/jdk/java/net/MulticastSocket/SetLoopbackModeIPv4.java