fix the command output (#9636)
I have verified on version v1.10.0
[root@huan30:~]$ kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0-1", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"archive", BuildDate:"2018-06-13T04:29:49Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0-1", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"archive", BuildDate:"2018-06-13T04:22:05Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}