MetalLB as loadbalancer for on premise deployments (#3027)

* add metallb as loadbalancer for on premise deployments

* improve configuration

* add variables to DaemonSet

contrib/metallb/roles/provision/templates/metallb-config.yml.j2

@@ -0,0 +1,13 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  namespace: metallb-system
+  name: config
+data:
+  config: |
+    address-pools:
+    - name: loadbalanced
+      protocol: layer2
+      addresses:
+      - {{ metallb.ip_range }}