[RFR] 8224645: Test java/nio/channels/DatagramChannel/BasicMulticastTests.java fails with NoSuchElementException

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8224645
webrev: http://cr.openjdk.java.net/~aeubanks/8224645/webrev.00/

Test java/nio/channels/DatagramChannel/BasicMulticastTests.java fails with
NoSuchElementException on Solaris.

java.util.NoSuchElementException
at java.base/java.util.Spliterators$1Adapter.next(Spliterators.java:688)
at BasicMulticastTests.main(BasicMulticastTests.java:221)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at
com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)

at java.base/java.lang.Thread.run(Thread.java:830)

This changes the test to check if any multicast interfaces are available
for IPv4/IPv6 before testing one. This does have the effect of not failing
if no multicast interfaces available, which may or may not be desirable.
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