Update README for grpc

Author: feiskyer

README.md

@@ -51,6 +51,6 @@ kubestack -logtostderr=true -v=4 -port=:4237
 Configure kubernetes `controller-manager` and `kubelet` using openstack network provider:
 
 ```
-kube-controller-manager --network-provider=localhost:4237 --...
+kube-controller-manager --network-provider=127.0.0.1:4237 --...
 kubelet --network-provider=127.0.0.1:4237 --....
 ```