Ability of slave to announce arbitrary ip/port to master.
This feature is useful, especially in deployments using Sentinel in order to setup Redis HA, where the slave is executed with NAT or port forwarding, so that the auto-detected port/ip addresses, as listed in the "INFO replication" output of the master, or as provided by the "ROLE" command, don't match the real addresses at which the slave is reachable for connections.
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