[ipv6]: 8224081: SOCKS v4 doesn't work with IPv6

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8224081
webrev: http://cr.openjdk.java.net/~aeubanks/8224081/webrev.00/index.html

Tests that try to use SOCKS v4 will fail in an IPv6 only environment since
SOCKS v4 does not support IPv6. SOCKS v5 does support IPv6.
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