[ipv6]: 8224019: test/jdk/java/nio/channels/DatagramChannel/BasicMulticastTests.java assumes IPv4 is always available

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8224019
webrev: http://cr.openjdk.java.net/~aeubanks/8224019/webrev.00/index.html

test/jdk/java/nio/channels/DatagramChannel/BasicMulticastTests.java assumes
NetworkConfiguration.probe().ip4MulticastInterfaces().iterator() always has
at least one NetworkInterface. Instead it should do something like the IPv6
code right after it where it checks that the iterator is not empty.
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