RFR: 8133015 - InetAddress.isReachable(tmout) returning wrong value on Windows for IPv6

[Rob McKenna]

Hi folks,

Upon investigating what turned out to be a network traffic filtering 
problem it was noticed that Windows InetAddress.isReachable() leverages 
TCP to detect other hosts on the network. Since new APIs for using ICMP 
have been implemented in Windows 2000 it could be helpful to support them.

This implementation removes the TCP call but it might make sense to keep 
that for redundancy. (though that could get messy when trying to take 
timeouts into account)

http://cr.openjdk.java.net/~robm/8133015/

	-Rob