etcd: expect 'is healthy' status in stdout or in stderr

In certain scenarios (for example the old etcd version), even when a command executes without errors (.rc=0), the output may reside in stderr instead of stdout. Now we accommodate for 'is healthy' in either output stream.

roles/etcd/tasks/main.yml

@@ -132,15 +132,20 @@
       environment:
         ETCDCTL_API: "3"
       register: etcd_health_result
-      until: "'is healthy' in etcd_health_result.stdout"
+      until: >
+        'is healthy' in etcd_health_result.stdout or 
+        'is healthy' in etcd_health_result.stderr
       retries: 10
       delay: 10
       changed_when: false
       ignore_errors: false
 
     - name: cluster health
       ansible.builtin.debug:
-        msg: "{{ etcd_health_result.stdout }}"
+        msg: >
+          {{ etcd_health_result.stdout
+          if etcd_health_result.stdout | length > 0
+          else etcd_health_result.stderr }}
   when: not ansible_check_mode
   tags: etcd, etcd_start, etcd_status