Add errmsg callback to udp
Summary: Adds the ability for UDP sockets to optionally listen to errors that happen on the socket, for example ICMP errors. In this iteration, we explicitly do not register for read events if an error callback is set. So even if you set an error callback to get error events you must register a read callback. Reviewed By: yfeldblum Differential Revision: D7632877 fbshipit-source-id: 43c922d0145e1da97b993f5bf4058c20d3469deb
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