Qt4: rework HTTP sout box
The address field is removed, as it is quite useless. The default unspecified value works just fine. In fact, it works better than 0.0.0.0 as it allows both IPv6 and IPv4 automatically. A new path field is added for the local path, defaults to '/' consistent with HTTP URI semantics ("http://www.example.com" really means "http://www.example.com/").