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Before this PR, people can set listen-client-urls without setting advertise-client-urls, and leaves advertise-client-urls as default localhost value. The client libraries which sync the cluster info fetch wrong advertise-client-urls and cannot connect to the cluster. This PR avoids this case and provides better UX. On the other hand, this change is safe because people always want to set advertise-client-urls if listen-client-urls is set. The default localhost advertise url cannot be accessed from the outside, and should always be set except that etcd is bootstrapped with no flag.