Connection errors are not exposed

[pimterry]

node-spdy/lib/spdy/server.js

Lines 127 to 129 in 9f96629

	connection.on('error', function () {
	socket.destroy()
	})

Here ⬆️ the server listens for connection errors, and then silently shuts down the socket.

It doesn't provide any easy way to listen for these errors though, like Node HTTP/1.1's clientError event or HTTP/2's sessionError event, so code using node-spdy never knows that this has happened.

This can be useful for error reporting and monitoring. I'm going to work around this manually in my application, but built-in support would be useful. Are you be open to a PR adding this?