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(@vyzo CR)

This causes us to send RST packets instead of FIN packets when closing
connections and means connections immediately enter the "reset" state instead of
entering the TIME-WAIT state.

Importantly, this means we can immediately reuse the 5-tuple and reconnect.

Also, refactor out reuseport logic into a separate package.

This reverts commit 5ebce0ea.

If we do this, we end up using the source *port* for dialing. That's not what we
want when not using reuseport.

fixes #19

1. Migrate to libp2p repo.
2. Pull in fixes for edge platforms. Related: use `x/sys` instead of `syscall`
   when possible.
3. Pull in less complicated and slightly faster dial logic.

This reverts commit f475bdfd.

Timeout should only be set by using contexts.

The tpt.ConnWrap is being removed from go-libp2p-transport

It got skipped when go-reuseport got migrated to context