auto merge of #15265 : omasanori/rust/udp, r=alexcrichton
POSIX has recvfrom(2) and sendto(2), but their name seem not to be suitable with Rust. We already renamed getpeername(2) and getsockname(2), so I think it makes sense.
Alternatively, `receive_from` would be fine. However, we have `.recv()` so I chose `recv_from`.
What do you think? If this makes sense, should I provide `recvfrom` and `sendto` deprecated methods just calling new methods for compatibility?
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