enable listening on IPv6

[toddjcrane]

small modification to allow listening on IPv6 addresses

[toddjcrane]

I still need to write tests for this

[jonashaag]

Hi thanks for the patch. Minor things:

• how do I listen on all IPv4 interfaces? With your code it's possible to only listen on all IPv6 interfaces if I understand it correctly
• there's repeated code there that can easily be put into a function or conditional statement

Tests aren't really necessary, just look at all the other test cases, none if them are actual tears, more like examples...

[toddjcrane]

To listen on all IPv4, listen on 0.0.0.0
I thought about it and decided to set the default to listen on IPv6 as listening on all IPv6 will also listen on all IPv4. Also, there was a bit of a (not so) hidden agenda to further IPv6 enable the internet.

I'll make the refactoring changes to eliminate repetitive code and I'll have it up here shortly

[holms]

Can this be confirmed please?

[jonashaag]

The patch needs some minor refactoring before it can be landed.