Add loadbalancerip (#1265)

* Add ability to configure loadbalancerip on service
* Add docs for configuring loadbalancerip

roles/installer/templates/networking/service.yaml.j2

@@ -53,6 +53,9 @@ spec:
   type: NodePort
 {% elif service_type | lower == "loadbalancer" %}
   type: LoadBalancer
+{% if variable is defined and variable|length %}
+  loadbalancerip: '{{ loadbalancer_ip }}'
+{% endif %}
 {% else %}
   type: ClusterIP
 {% endif %}