Automatic merge from submit-queue
Add more global options to local-up-cluster.sh
I added a couple more global variables to the `local-up-cluster.sh` script.
The `KUBELET_HOST` environment name make sense to me. If it isn't the best name I will change it.
The `ETCD` ones make sense since they are being used under `hack/lib/etcd.sh`
Signed-off-by: André Martins <aanm90@gmail.com>