CR 6800805 - code review

[Christopher Hegarty - Sun Microsystems Ireland]

I need to get a code review for
   6800805: java.net.NetworkInterface.getNetworkInterfaces() does not 
list IPv6 network interfaces correctly.

http://cr.openjdk.java.net/~chegar/6800805/webrev.00/

There is a change in behaviour between JDK5 and JDK6 in how virtual 
interfaces addresses are reported. This is as a result of the change for 
CR 6386190. This change uses an ioctl to determine if the parent 
interface is accessible from the current context. The problem is that on 
Solaris if the interface being queried has only IPv6 addresses assigned 
to it then the ioctl needs to be called with an IPv6 socket. This is 
currently not the case.

To fix this bug we need to try with an IPv6 socket before determining 
that the parent is not accessible, similar to what we done for CR 6628569.

Thanks,
-Chris.