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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