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etcd always returns 500/503 response when it may have no leader. So we should log the other 50x response in a normal way. This helps to log correctly when discovery meets 504 error. Before this PR, it logs like this: ``` 18:31:58 etcd2 | 2015/08/4 18:31:58 discovery: error #0: client: etcd member https://discovery.etcd.io has no leader 18:31:58 etcd2 | 2015/08/4 18:31:58 discovery: waiting for other nodes: error connecting to https://discovery.etcd.io, retrying in 4s ``` After this PR: ``` 22:20:25 etcd2 | 2015/08/4 22:20:25 discovery: error #0: client: etcd member https://discovery.etcd.io returns server error [Gateway Timeout] 22:20:25 etcd2 | 2015/08/4 22:20:25 discovery: waiting for other nodes: error connecting to https://discovery.etcd.io, retrying in 4s ``` Conflicts: client/client.go