Orders ipv6 addresses before v4 in resolution.

[tlm]

When performing mdns or dns resolution for a given hostname v4 addresses are always returned for the connection over v6 when an address supports dual stacks.

This allows for ipv6 transitioning and testing in a dual stack environment. It also follows common practice when picking the right address to try first.

Not addressed by this commit is the ability to fall back to other resolved addresses should the first address fail. This feature is addressed by other todo's in the project.