Fix "can't bind to address" error reporting.
Report the actual port used for the listening attempt instead of server.port. Originally, Redis would just listen on server.port. But, with clustering, Redis uses a Cluster Port too, so we can't say server.port is always where we are listening. If you tried to launch Redis with a too-high port number (any port where Port+10000 > 65535), Redis would refuse to start, but only print an error saying it can't connect to the Redis port. This patch fixes much confusions.
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