[metallb] Add variable for the metallb namespace (#11136)

roles/kubernetes-apps/metallb/tasks/main.yml

@@ -33,7 +33,7 @@
     - inventory_hostname == groups['kube_control_plane'][0]
 
 - name: Kubernetes Apps | Wait for MetalLB controller to be running
-  command: "{{ bin_dir }}/kubectl rollout status -n metallb-system deployment -l app=metallb,component=controller --timeout=2m"
+  command: "{{ bin_dir }}/kubectl rollout status -n {{ metallb_namespace }} deployment -l app=metallb,component=controller --timeout=2m"
   become: true
   when:
     - inventory_hostname == groups['kube_control_plane'][0]
@@ -104,5 +104,5 @@
     name: config
     kubectl: "{{ bin_dir }}/kubectl"
     resource: ConfigMap
-    namespace: metallb-system
+    namespace: "{{ metallb_namespace }}"
     state: absent