[ipv6] RFR: 8224256: test/jdk/java/security/SecureClassLoader/DefineClass.java hardcodes 127.0.0.1

[Arthur Eubanks]

bug: https://bugs.openjdk.java.net/browse/JDK-8224256
webrev: http://cr.openjdk.java.net/~aeubanks/8224256/webrev.00/index.html

test/jdk/java/security/SecureClassLoader/DefineClass.java checks that a
security manager works with "http://127.0.0.1". This fails on IPv6-only
systems.

This change tests 127.0.0.1 if IPv4 is available, then tests ::1 if IPv6 is
available. Created a new class for testing ::1 since we can't have
duplicate classes.
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