Add more arguments to SocketAddress::GetAddressInfo

Summary:
the reason for this is two-fold:
- getaddrinfo without the extra arguments will return the same
(network-level) address multiple times, once for each supported
transport protocol, which is not what is usually intended (it certainly
wasn't in D31823)
- it enables us to rewrite the getaddrinfo member function in terms of
the static GetAddressInfo function.

Reviewers: beanz, tberghammer

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D32357

llvm-svn: 301168