add external ip/port for load balancer for RPC queries

[gregcusack]

The cluster now has an external IP/port that can be queried to reach the cluster RPC. The external RPC port is 30000.

1. Get one of the node ips. Can pick anyone:

kubectl get nodes -o wide

2. Run your query. e.g.

curl -X POST \
-H "Content-Type: application/json" \
-d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getClusterNodes"
    }' \
http://<node-ip>:30000

[CriesofCarrots]

Just doc nits