Wrong IPv6 returned

NodeJS version: 6.0.0

JS Source:

``` js
ip.address( 'public', 'ipv6' ) // returns fe80::ad42:39c7:ff81:733
```

OS:

``` zsh
$ ip addr
ens160: mtu 1500 qdisc fq_codel state UP group default qlen 1000
inet6 2003:6a:6808:3f01:64d6:e507:513e:71ec/64 scope global mngtmpaddr noprefixroute dynamic
```

I shortened the output just because the rest is not important :)

Thank you in advance!

---

Updated NodeJS to max ( actually 6.1.0 ) still the same error.

I attach also the native output of NodeJS:

``` js
console.log( require('os').networkInterfaces() );
/*
ens160:
[ ...
{ address: '2003:6a:6808:3f01:64d6:e507:513e:71ec',
netmask: 'ffff:ffff:ffff:ffff::',
family: 'IPv6',
mac: 'xxx',
scopeid: 0,
internal: false },
{ address: 'fe80::ad42:39c7:ff81:733',
netmask: 'ffff:ffff:ffff:ffff::',
family: 'IPv6',
mac: 'xxx',
scopeid: 2,
internal: false } ] }
*/
```

Reproduce ip.address('public', 'ipv6') using the interface data shown in the issue and compare it with Node's os.networkInterfaces() output. Trace how the public IPv6 address is selected; done means the call returns the global address 2003:6a:6808:3f01:64d6:e507:513e:71ec rather than the fe80:: link-local address.

Written by the indexing model from the issue text.