Fix #38: Kibana ops console is not accessible
Fix #38: Kibana ops console is not accessible

Fixed url for PUBLIC_MASTER_URL to used the new environment variable __OS_PUBLIC_IP
Added KIBANA_OPS_HOSTNAME with the correct value to reduce the amount of code to be added by user when enablig OPS cluster and ES_OPS_CLUSTER_SIZE doesn't need to be set as it reuses the value of ES_CLUSTER_SIZE if not provided.

openshift-evangelists/vagrant-origin,openshift-evangelists/vagrant-origin