[Reviewer: Rob] Take new HttpResolver/HttpConnection

Rob,

Please can you review my fix to make ralf take the new HttpResolver/HttpConnection?

I've UT-ed but not live-tested - any idea how live test works for Ralf?

Thanks,

Matt
Do we support having Diameter on IPv6 and HTTP on IPv4 (or vice-versa)? I didn't think we supported dual-stack at all. If not, we could simplify this.