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Automatic merge from submit-queue add master address into kubeadm join help message and some validations **What this PR does / why we need it**: 1, add master address into kubeadm join help message. looks like : >Usage: > kubeadm join <master address> [flags] 2, when user provides more than one master address, return an error. 3, since `kubeadm join` not only support ip addresses but also host names or domain names, so i delete the word `ip` from error message `must specify master ip address (see --help)` Signed-off-by: bruceauyeung <ouyang.qinhua@zte.com.cn>