to iterate over all possible addresses, as suggested privately by Rene.
* Added flags to the resolving methods that allow more control over the
addresses returned.
* Added setters to BNetworkAddress that accept a service name instead of port
number, renamed PortName() to ServiceName().
* Made the sockaddr* cast operators return a const sockaddr as it was supposed
to be, although I should probably add non-const ones as well.
* This also simplified the code somewhat.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38039 a95241bf-73f2-0310-859d-f6bbb57e9c96
