RFR: 8207404: MulticastSocket tests failing on AIX

[Langer, Christoph]

Hi,

here is a fix for the MulticastSocket tests failing on AIX (in certain sceanrios):

Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8207404.0/
Bug: https://bugs.openjdk.java.net/browse/JDK-8207404

First of all, I "modernized" the testcases test/jdk/java/net/MulticastSocket/SetGetNetworkInterfaceTest.java and test/jdk/java/net/MulticastSocket/Test.java to make use of test/lib/jdk/test/lib/NetworkConfiguration.java which probes for the network configuration and returns lists of local interfaces or addresses for certain use cases. In NetworkConfiguration.java I made some cleanups and enhancements which will hopefully find some appreciation. These 3 tests will now also be executed with and without -Djava.net.preferIPv4Stack=true.

The actual fixes are:
test/jdk/java/net/MulticastSocket/JoinLeave.java:
test/jdk/java/net/MulticastSocket/SetGetNetworkInterfaceTest.java:
-> NetworkConfiguration.ip4MulticastInterfaces() will now, on AIX, in a scenario where IPv6 is available, filter out interfaces that only have IPv4 addresses (line 121ff in test/lib/jdk/test/lib/NetworkConfiguration.java)

test/jdk/java/net/MulticastSocket/Test.java:
-> The test for node local multicasting is only executed, when NetworkConfiguration::hasTestableIPv6Address is true. For AIX it'll be the case only if a "real" IPv6 address exists (on some interface) which is not loopback or wildcard. This is how it has already been for Solaris. For other operating systems, any IPv6 address on any interface is sufficient for running the test. The coding for the AIX/Solaris check can be found in line 66ff of test/lib/jdk/test/lib/NetworkConfiguration.java.

As it is a test only fix, I request to do it in JDK12.

Thanks & Best regards
Christoph

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