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/tasks/main.yml

@@ -0,0 +1,16 @@
+---
+- name: "Kubernetes Apps | Lay Down MetalLB"
+  become: true
+  template: { src: "{{ item }}.j2", dest: "{{ kube_config_dir }}/{{ item }}" }
+  with_items: ["metallb.yml", "metallb-config.yml"]
+  register: "rendering"
+  when:
+    - "inventory_hostname == groups['kube-master'][0]"
+- name: "Kubernetes Apps | Install and configure MetalLB"
+  kube:
+    name: "MetalLB"
+    filename: "{{ kube_config_dir }}/metallb.yml"
+    state: "{{ item.changed | ternary('latest','present') }}"
+  with_items: "{{ rendering.results }}"
+  when:
+    - "inventory_hostname == groups['kube-master'][0]"