kms: extend the Client.Restart API to support cluster-wide restarts
#40
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This commit changes the behavior of
Client.Restartsuch that it uses the cluster-wide restart mechanism to restart all nodes within a cluster.The adv. of the new cluster-wide restart is that a client doesn't have to know all cluster nodes to restart all nodes within a cluster. Instead, it can delegate this task to one of the cluster nodes.
However, a client can still restart all cluster nodes itself by providing a list of hosts.