String to specify to KUBE_SERVICE_ADDRESSES (API Server configuration)
According to this Q&amp;A and this code the --portal_net was renamed to --service-cluster-ip-range since version 0.18.


# --service-cluster-ip-range=&lt;nil&gt;: A CIDR notation IP range from which to assign service cluster IPs.
# This must not overlap with any IP ranges assigned to nodes for pods.
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=${SERVICE_CLUSTER_IP_RANGE}"