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Use connected UDP sockets for outgoing queries

It'd be nice to use connected UDP sockets for outgoing queries as it makes it a little bit harder to spoof, and a bit more efficient as kernel can discard dgrams from different source addresses than the connected one.

Currently libuv doesn't have a facility for connected UDP sockets, so I'm creating the issue to track this when it gets it: https://github.com/libuv/leps/pull/10

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