Add etcd key and cert environment variables for use with client auth

roles/network_plugin/calico/rr/tasks/main.yml

@@ -57,6 +57,9 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   delegate_to: "{{groups['etcd'][0]}}"
+  environment:
+    ETCDCTL_CERT: "{{ etcd_cert_dir }}/node-{{ inventory_hostname }}.pem"
+    ETCDCTL_KEY: "{{ etcd_cert_dir }}/node-{{ inventory_hostname }}-key.pem"
 
 - meta: flush_handlers