connect: Add connection delay to Happy Eyeballs.
This patch adds a 200ms delay between the first and second address family socket connection attempts. It also iterates over IP addresses in the order returned by the system, meaning most dual-stack systems will try IPv6 first. Additionally, it refactors the connect code, removing most code that handled synchronous connects. Since all sockets are now non-blocking, the logic can be made simpler.
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