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raft: Allow Join to be called multiple times for the same cluster member
If Join is called and the member already exists in the cluster, instead of returning an error, it will update the node's address with the new one provided to the RPC. This will allow managers to update their addresses automatically on startup, if they were configured to autodetect the addresses. It will also be possible to manually repeat the "docker swarm join" command, to specify a different advertise address, or rejoin a cluster when all known manager IPs have changed. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
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