Review request: JDK-8080108: [TEST_BUG] ERROR: No IPv6 address returned from platform

[Alexander Fomin]

Hello,

Please review the test bug fix
https://bugs.openjdk.java.net/browse/JDK-8080108

See webrev here
http://cr.openjdk.java.net/~kshefov/8080108/webrev.00/

The original test 
(com/sun/jndi/dns/IPv6NameserverPlatformParsingTest.java @bug 6991580) 
fails automatically if /etc/resolv.conf file doesn't contain IPv6 
nameserver entries.
It's needed to edit /etc/resolv.conf manually before the test run, so 
this is a manual regression test.
The test is intended to be run on non-Windows systems.

Fix:
- provided standard test machinery for regression manual tests with 
instructions for a user;
- the test excluded for Windows.

Tested on Linux and Windows(to make sure it's excluded).

Thanks,
Alexander