RFR:8046500 GetIpAddrTable function failed on Pure Ipv6 environment

[vyom tewari]

Hi,

Please review the below code change.

Webrev: http://cr.openjdk.java.net/~vtewari/8046500/webrev0.0/index.html

BugId:      https://bugs.openjdk.java.net/browse/JDK-8046500

This issue is specific to pure ipv6 environment, In pure ipv6 
environment  if "enumInterface" fails,  i am clearing the exception and 
continue processing the IPv6 interface configurations.

I tested this issue locally, by uninstalling IPv4(netsh interface ipv4 
uninstall) on my Windows 10 laptop.

Thanks,

Vyom