8246114: java/net/MulticastSocket/Promiscuous.java fails after 8241072 (multi-homed systems)

[Daniel Fuchs]

Hi,

Please find a trivial fix for:

8246114: java/net/MulticastSocket/Promiscuous.java fails after
          8241072 (multi-homed systems)
https://bugs.openjdk.java.net/browse/JDK-8246114

webrev:
http://cr.openjdk.java.net/~dfuchs/webrev_8246114/webrev.00/

The test should only use NetworkInterfaces for which an IPv4 address
is configured, since it's trying to join an IPv4 group.

best regards,

-- daniel