[ipv6]: 8224018: test/jdk/java/net/ipv6tests/{Tcp,Udp}Test.java assume IPv4 is available

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8224018
webrev: http://cr.openjdk.java.net/~aeubanks/8224018/webrev.00/

test/jdk/java/net/ipv6tests/{Tcp,Udp}Test.java both assume that IPv4 is
available. They will currently bail if IPv6 is not available. They should
also bail if IPv4 is not available.
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