Fix calico-kube-controller becomes Error (#7548)

Change mode so that calico-kube-controllers can be read because it was changed to run as non-root
https://github.com/projectcalico/kube-controllers/pull/566

roles/network_plugin/calico/tasks/install.yml

@@ -28,6 +28,7 @@
     src: "{{ etcd_cert_dir }}/{{ item.s }}"
     dest: "{{ calico_cert_dir }}/{{ item.d }}"
     state: hard
+    mode: 0640
     force: yes
   with_items:
     - {s: "{{ kube_etcd_cacert_file }}", d: "ca_cert.crt"}