Fix calico-kube-controller becomes Error for canal (#7564)

roles/network_plugin/canal/tasks/main.yml

@@ -20,6 +20,7 @@
     src: "{{ etcd_cert_dir }}/{{ item.s }}"
     dest: "{{ canal_cert_dir }}/{{ item.d }}"
     state: hard
+    mode: 0640
     force: yes
   with_items:
     - {s: "{{ kube_etcd_cacert_file }}", d: "ca_cert.crt"}