k8s_scale fubar, switch to k8s, proper attrs

roles/federate-clusters/tasks/main.yml

@@ -192,5 +192,6 @@
     name: admission-control
     namespace: "{{ clusters[cluster].namespace }}"
     resource_definition:
-      replicas: "{{ clusters[cluster].admission_instances | default(3) }}"
+      spec:
+        replicas: "{{ clusters[cluster].admission_instances | default(3) }}"
 ...