RFR: 8220083: Use InetAddress.getLoopbackAddress() in place of 127.0.0.1 for some tests

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8220083
webrev: http://cr.openjdk.java.net/~aeubanks/8220083/webrev.00/

First of a few ipv6 patches to come.
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