purge: remove leftover unit files

Closes https://github.com/ceph/ceph-ansible/issues/1672

Signed-off-by: Sébastien Han <seb@redhat.com>

infrastructure-playbooks/purge-cluster.yml

@@ -77,7 +77,6 @@
     failed_when: false
     when: ansible_service_mgr == 'upstart'
 
-
 - name: purge ceph rgw cluster
 
   vars:
@@ -511,6 +510,11 @@
     register: check_for_running_ceph
     failed_when: check_for_running_ceph.rc == 0
 
+  - name: remove ceph systemd unit files
+    shell: rm -rf /etc/systemd/system/ceph*
+    changed_when: false
+    when: ansible_service_mgr == 'systemd'
+
 
 - name: purge fetch directory