Do not use ‘yes/no’ for boolean values (#11472)

Consistent boolean values in ansible playbooks

roles/etcd/tasks/join_etcd_member.yml

@@ -33,7 +33,7 @@
     executable: /bin/bash
   register: etcd_member_in_cluster
   changed_when: false
-  check_mode: no
+  check_mode: false
   retries: "{{ etcd_retries }}"
   delay: "{{ retry_stagger | random + 3 }}"
   until: etcd_member_in_cluster.rc == 0
@@ -50,4 +50,4 @@
   service:
     name: etcd
     state: started
-    enabled: yes
+    enabled: true