remove_cluster: ignore the error if the patroni service is unavailable

an error may occur when trying to delete a partially deployed cluster, for example, when only etcd/consul is deployed.

Example: vitabaks#271 (reply in thread)

Author: vitabaks

remove_cluster.yml

@@ -14,6 +14,8 @@
         name: patroni
         state: stopped
         enabled: false
+      ignore_errors: true
+      when: remove_postgres|bool
     - name: Delete PostgreSQL database content
       file:
         path: "{{ postgresql_data_dir }}"