Revert "Give kubelet the node-ip value (#5579)"

This reverts commit aa9065749c.

Setting dual-stack node-ip does not work when --cloud-provider is set
to anything, including 'external'. Just set node-ip to the first IP, and
let the cloud provider add the other address.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

pkg/daemons/agent/agent_linux.go

@@ -121,11 +121,9 @@ func kubeletArgs(cfg *config.Agent) map[string]string {
 	if cfg.NodeName != "" {
 		argsMap["hostname-override"] = cfg.NodeName
 	}
-	if nodeIPs := util.JoinIPs(cfg.NodeIPs); nodeIPs != "" {
-		defaultIP, err := net.ChooseHostInterface()
-		if err != nil || defaultIP.String() != nodeIPs {
-			argsMap["node-ip"] = nodeIPs
-		}
+	defaultIP, err := net.ChooseHostInterface()
+	if err != nil || defaultIP.String() != cfg.NodeIP {
+		argsMap["node-ip"] = cfg.NodeIP
 	}
 	kubeletRoot, runtimeRoot, controllers := cgroups.CheckCgroups()
 	if !controllers["cpu"] {